The Marin County Case
An Infected Teacher Reads to Her Class, and 55% of Students Come Down with COVID. Masking, Ventilation and HEPA Filters Weren’t Enough.
“On May 25, 2021, the Marin County Department of Public Health (MCPH) was notified by an elementary school that on May 23, an unvaccinated teacher had reported receiving a positive test result for SARS-CoV-2, the virus that causes COVID-19.”
So begins one of the most fascinating and important investigations we’ve read during this pandemic. It appeared in the Aug. 27 edition of the CDC’s Morbidity and Mortality Weekly Report (MMWR).
The report – whose lead author was Tracy Lam-Hine of the MCPH and the University of California at Berkeley School of Public Health – focused on the behavior of the elementary school teacher, the high level of student masking and distancing in the classroom, and the frightening rate of infection among those students.
But there is another lesson here that the report does not explore but that deserves serious attention: the inadequacy of CDC-recommended measures to remove SARS-CoV-2 from interior air.
Marin, California, a suburb of San Francisco, is the 14th richest county in the nation. Some 75% of its residents are fully vaccinated – the highest rate in the state and one of the highest in the country.
The unnamed, unvaccinated teacher was reading aloud to students and “reportedly unmasked” even though the school required it. The teacher also “became symptomatic on May 19 with nasal congestion and fatigue” but continued working through May 21. The students, it appears, were masked, and parents of those infected “suggested that students’ adherence to masking and distancing guidelines in line with CDC recommendations was high in class.” Desks were all spaced six feet apart.
Between May 23 and 26, all but two of the 24 students were tested for COVID, and 12 of them came up positive – a 55% rate. Eight of the 12 were symptomatic, including four of the five students in the first row (the fifth tested positive as well). In the second row, three of four students tested received positive results, as did two of four in the fifth row, despite being 30 feet away from the teacher. The case provides a powerful example of how the SARS-CoV-2 virus can linger in the air, drifting far from its original source.
In another classroom, separated from the first by a large outdoor courtyard, 14 students were tested, and six received positive results. Several students in other grades, siblings of those in the original classroom, were later found to be infected, as were four parents (only one of whom was unvaccinated). In all, there were 27 cases, all apparently stemming from the index case involving the teacher.
The rapid spread of the virus throughout the classroom occurred before the Delta variant, which is twice as contagious as previous variants, became established as dominant in the United States. In late May, Delta (B.1.617.2) accounted for only about 5% of cases.
But how exactly did the spread occur in the teacher’s classroom? Below is a diagram from the MMWR report:
In the school, the report notes, “All classrooms had portable high-efficiency particulate air filters and doors and windows were left open.” In fact, as you can see from the diagram, the room was receiving a good deal of cross-ventilation. Ventilation plus high-efficiency particulate air (HEPA) filters is what the Centers for Disease Control and Prevention (CDC) recommends for interior spaces.
A single case is not dispositive, of course, but the CDC should take careful note of the Marin County experience, and a reconsideration of its advice may be in order. The CDC says it bases its recommendations on guidance from ASHRAE, the American Society of Heating, Refrigeration, and Air-Conditioning Engineers, a trade group dominated by the HVAC industry.
The question that CDC, other government agencies, and facilities managers should explore is whether ventilation (either via open windows or HVAC systems) combined with a passive filtration system like HEPA is the best means of mitigating indoor pathogens like SARS-CoV-2. The Marin experience shows that it is not.
The CDC recommends a “layered approach,” and that is certainly correct. Ventilation is necessary but not sufficient. Filters, on the other hand, present problems, the main one being that they are passive. They sit there waiting for pathogens to come to them. But not all pathogens do. Some continue to float in the air, and ventilation, as we saw in Marin, blow them all over an enclosed space. It’s almost certain that some pathogens won’t flow to where the HEPA unit is placed (in this case at the front of the room). In the back two rows, at a minimum of 24 feet away from the teacher, 37.5% of students tested positive.
The alternative to passive filtration is active antiviral elimination – that is, a system that sends particles throughout a space at high speed to deactivate pathogens chemically. Some of these systems also have deficiencies, including production of toxic byproducts like formaldehyde as well as ozone. More advanced versions, including one called Advanced Photocatalysis, developed by the Dallas firm ActivePure, create more efficient reactions, reducing rather than creating byproducts. In trials involving rooms that were already equipped with filter systems, Advanced Photocatalysis was found to reduce the level of pathogens by more than 50%.
CDC is correct to advocate a layered response to COVID, but each of those layers needs to work with maximum effectiveness. Yes, the teacher should have been vaccinated, but it is clear that a large segment of the U.S. population will never be vaccinated. Yes, the teacher should have been wearing a mask, but all of the students evidently were and masking every minute of a workday or school day is nearly impossible. Yes, the teacher should have reported a possible infection right away, but as we enter the cold and flu season, not every runny nose equals COVID. Yes, ventilation is necessary, but large banks of windows were open on a California spring.
The layered element that needs addressing is one that supplements ventilation. In the case of Marin, mitigation was passive and demonstrably ineffective. Mitigation, it seems logical to conclude, needs to be active: seek and deactivate. The CDC and everyone concerned about limiting the damage of COVID would do well to look beyond HVAC industry guidance, as school systems in Philadelphia and throughout the country are currently doing.
The Late-Summer Surge Is On
In mid-June, the U.S. was registering just 12,000 new cases of COVID-19 a day. On Aug. 14, the seven-day average had reached 130,000 in a surge that looks similar to that of last summer – except that this time the magnitude is greater (the surge of summer 2020 topped out at 67,000), and more young people are getting sick. This year’s late-summer surge is particularly disturbing because more than half the population is fully vaccinated, compared with zero a year ago. The disparity is almost certainly the result of the Delta variant, which is twice as transmissible as the original Wuhan strain of SARS-CoV-2, according to the American Society for Microbiology.
If the U.S. pattern in 2020 holds again this year, we can expect daily cases to start declining soon, then picking up again in mid-September and climbing to another peak in January or February. These ups and downs appear correlated to interior activity, with Americans in the South moving indoors in July to escape the heat, and those in the North going inside in the fall to escape the cold. Right now, it’s hot almost everywhere, and, according to the Centers for Disease Control (CDC), 2,691 counties are experiencing a “high” level of community transmission, compared with 200 counties deemed “low” or “moderate.” With just a few exceptions, the low and moderate counties are all in the northern part of the United States. Below is the CDC’s community-spread map as of Aug. 9, with low and moderate in blue and yellow, respectively.
Consider Florida, where COVID hospitalizations just set a record. Florida has 6% of the U.S. population but is responsible for 18% of all COVID cases, and Florida’s case positivity rate is an astounding 18.9%, up from 3.6% just a month earlier. The rate for children aged 12 to 18 is 20.1%. Low overall vaccination rates don’t explain Florida’s surge. According to the latest report from Florida’s Department of Health, some 63% of Floridians have had at least one shot, compared with 58% nationwide, and 53% of Floridians are fully vaccinated, compared with 50% nationwide. In addition, 85% of Floridians over age 85 have received at least one shot.
Vaccines appear effective in reducing hospitalizations and deaths, but Delta leaves even people who have received shots vulnerable to infection, and the vaccinated can then pass the virus on to the unvaccinated. Research published in the New England Journal of Medicine on July 21 by Jamie Lopez Bernal of Public Health England and colleagues concluded, “Only modest differences in vaccine effectiveness were noted with the delta variant as compared with the alpha variant after the receipt of two vaccine doses. Absolute differences in vaccine effectiveness were more marked after the receipt of the first dose.” But a later study showed a big drop in effectiveness for the Pfizer vaccine even after two doses. (See more on both of these studies below.) Some 49% of Americans – and all young children – are not fully vaccinated, and they are particularly susceptible indoors, where the SARS-CoV-2 virus spreads more easily. Interior mitigation efforts have still not caught with the potency of the pathogen.
Learning To Live With COVID
The fact is that COVID-19 is not going away soon, and the world is learning to live with it as a long-term disease that requires adaptation, as much as we wish for eradication. Treatment has gotten better, and, while deaths are rising, at a seven-day daily average of 687 on Aug. 14, mortality is far lower than during previous peaks. But the point is that governments, businesses, and individuals are changing behavior as the effects of the virus change in their own communities.
The biggest change is that Centers for Disease Control (CDC) shifted its earlier guidance that people who have been vaccinated did not need to wear masks indoors. Instead, on July 28, the CDC urged vaccinated Americans to “Wear a mask in public indoor settings if they are in an area of substantial or high transmission.” A cascade followed.
The Wall Street Journal reported on Aug. 8 that “up until a few weeks ago, corporate leaders felt confident about what to expect this fall” as the COVID-19 pandemic receded. But “the swift, startling resurgence of swift, startling resurgence of COVID-19 cases and hospitalizations across the U.S. is causing corporate leaders to rip up playbooks for the next few months.” The Journal continued:
No longer is a September return a target for many companies. Some employers, such as banking giant Wells Fargo & Co. and managed-care company Centene Corp., have in recent days shifted return-to-office dates to October. Meanwhile, a range of other prominent companies now predict it will be 2022 until most workers return.
In a policy change, Tesla is now requiring masks at its giant battery facility even for workers who are vaccinated. The New York Auto Show, which was set to start Aug. 20, has been cancelled. New Orleans Jazz Fest, set for October, has now been pushed to the spring of 2022. And in a policy updated Aug. 5, the CDC issued guidance stating, “Due to the circulating and highly contagious Delta variant, CDC recommends universal indoor masking by all students (age 2 and older), staff, teachers, and visitors to K-12 schools, regardless of vaccination status.” Re-masking, however, is not popular, and some governors are disputing the CDC recommendation. Ron DeSantis of Florida has even threatened to withhold the salaries of local officials who mandate masks in schools.)
The rate of vaccinations started to increase in the U.S. in the third week of July, just as cases of COVID were rising. The daily average, as of Aug. 9, was 716,000, up from 507,000 on July 20 but still far below the 3.4 million mark set in early April. The New York Times projects that, at the current pace, 85% of Americans will have at least one shot by February 2022. That forecast may be pessimistic if attitudes change with two developments: first, the imminent full approval of the Pfizer-BioNTech vaccination by the U.S. Food & Drug Administration (FDA), and, second, requirements by more and more government agencies and businesses that workers and customers be vaccinated. The Pentagon, for example, announced Aug. 9 that all military members would have to receive shots starting in mid-September.
Still, surveys by the Kaiser Family Foundation indicate that 14% of Americans have said they will not get a vaccination, period. That proportion has not budged since polling began in December 2020, but the number of Americans saying they will “wait and see” or will get vaccinated “only if required” has declined. More important, even if the FDA gives approval, it will take many months to vaccinate all children, and, increasingly, they are the ones getting sick – though, on average, not nearly as sick as adults.
Mitigating Interior Spread
Living with COVID-19 becomes a less daunting prospect not just with the advent of vaccines but also with the knowledge that there are effective ways to mitigate interior spread. Surges, happening throughout the world, have multiple sources, but a major factor is the amount of time people are spending indoors without proper protection, including not merely sufficient ventilation but also anti-viral air purification, using such technologies as advanced photocatalysis.
The evidence that the SARS-CoV-2 virus could spread easily through aerosols was at first resisted by the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC). But nearly a year ago, a group of 239 scientists appealed to the medical community and international organizations that there “is significant potential for inhalation exposure to viruses in microscopic respiratory droplets (microdroplets) at short to medium distances (up to several meters, or room scale), and we are advocating for the use of preventive measures to mitigate this route of airborne transmission.” Since then, the danger of respiratory spread, especially indoors, has been widely recognized.
OSHA’s Misguided New Standards
Unfortunately, there remains confusion even in government agencies over the best ways to protect people in interior spaces. A good example is recent activity by the Occupational Safety & Health Administration (OSHA), part of the U.S. Department of Labor.
On June 21, the agency issued a “final interim rule” (ETS) to an Emergency Temporary Standard (ETS) to protect healthcare workers against COVID in their workplaces, including hospitals, nursing homes, clinics, and physicians’ and dentists’ offices. Comments on the rule face a deadline of Aug. 20, and it could be enacted shortly afterwards. “For the first time in its 50-year history,” says the filing in the Federal Register, “OSHA faces a new hazard so grave that it has killed nearly 600,000 people in the United States in barely over a year.” OSHA notes that “the [Labor] Secretary must issue an ETS in situations where employees are exposed to a ‘grave danger,’” and COVID today clearly qualifies.
The ‘grave danger’ standard permits OSHA to issue regulations on facemasks, distancing, record-keeping, and more. But especially relevant is a rule on ventilation. It states:
Improving existing ventilation and ensuring optimal performance of ventilation is an effective way to reduce viral transmission in occupational populations. Work sites with existing heating, ventilation, and air conditioning (HVAC) systems can utilize improvements to, and maintenance of, high performance ventilation as part of a layered response for infectious disease control.
So far, so good. Ventilation, through HVAC systems, replaces indoor air with outdoor air, and outdoor air is cleaner and safer, thanks to the oxidation that naturally occurs through sunshine. But ventilation alone is not enough, as OSHA recognizes. The Interim Final Rule recommends that ventilation be “complemented by other measures.” Specifically, the regulations require….
.…employers who own or control buildings or structures with an existing heating, ventilation, and air conditioning (HVAC) system(s) must ensure that…all filters are rated Minimum Efficiency Reporting Value (MERV) 13 or higher, if compatible with the HVAC system(s). If MERV-13 or higher filters are not compatible with the HVAC system(s), employers must use filters with highest compatible filtering efficiency for the HVAC system(s). 1910.502(k)(1)(iii).
Problems of Ventilation Plus Filtration
OSHA recognizes that HVAC systems can’t eliminate pathogens simply by exchanging air. The solution, says the agency, is adding a MERV-13 filter. That filter, says the rule, “is at least 85-percent efficient at capturing particles from 1 µm to 2 µm in size.” (1 µm, or micron, is one-one-millionth of a meter.) But a study published in the International Journal of Environmental Research and Public Health estimates that “the minimum size of the respiratory particle that can contain SARS-CoV-2 is approximately 0.4 μm.” A MERV-13 filter captures only 66% of particles between 0.3 µm and 1 µm in size.
Filters placed on ventilation systems present other problems as well:
Also, it’s critical to understand just how much ventilation is necessary to clean interior air. Ventilation systems use a measurement called Air Changes per Hour (ACH), that is, the number of times an hour that the system brings in a volume of fresh air equal to the room volume. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) recommends a minimum of 0.35 ACH for homes. Schools should be designed to have 3 ACH, but most fall short of that level in practice. The CDC recommends between 6 ACH and 15 ACH for hospitals.
But an “air change” does not immediately make interior air perfectly clean and safe. As fresh air comes in, it mixes with interior air, which can be contaminated. The entire mixture becomes diluted with some proportion of contamination still present, so increasingly large amounts of new air are needed in order to remove the same amount of contaminants as earlier injections of outside air. According to the CDC’s calculations, a room served by a system generating 4 ACH will still take 104 minutes to eliminate 99.9% of the room’s initial concentration of contaminants, and, of course, during that nearly two-hour period, many contaminated people can enter the room.
A Better Way to Augment Ventilation Systems
Many healthcare facilities managers have found a better way to augment their current HVAC systems: purchase relatively low-cost units that generate submicroscopic particles that flow immediately through the air and inactivate pathogens, even on surfaces. These units can either be placed on existing HVAC systems, without causing a pressure drop, or can stand alone.
For example, the Philadelphia School District (PSD) purchased 9,500 anti-viral air-purification devices last month from ActivePure, a Dallas-based company that uses a process called advanced photocatalysis. The FDA has granted clearance to the ActivePure Medical Guardian, which uses the same technology as the company’s other devices. Says a PSD release:
Unlike conventional filtration-based air purifiers, these purifiers work immediately and do not require capture or exposure time. They work by rapidly and continuously filling a room with virus-neutralizing particles to instantly break viruses down to their component parts, eliminating them on contact.
By contrast, the OSHA regulations appear to be misguided and antiquated, ignoring solutions that are both more effective in inactivating pathogens and more cost-effective. One reason may be that they are informed by ASHRAE, a trade association influenced by large HVAC companies. For example, the president and one of the four vice presidents are both executives of Trane, the Ireland-domiciled HVAC giant with a market capitalization of $46 billion.
The ventilation industry has failed to keep people safe indoors for decades now, but it is encouraging to see more attention paid to health rather than to just heating and cooling. Still, the limitations of ventilation in maintaining health need to be recognized. Kenneth and Gary Elovitz, two Massachusetts energy economists, wrote last year in HPAC Engineering, “The primary role of HVAC systems is to maintain comfort, usually measured by temperature, humidity, and odor control in the conditioned space.” Now, because HVAC systems move air, “there is interest in whether HVAC systems can play a role in managing infectious disease transmission.” But, they write, “HVAC systems cannot be the primary means of infectious disease control.” They conclude:
No practical amount of ventilation can be relied on or expected to protect occupants over long exposure times like the 6 or 8 hours people might spend together in an office or school classroom. Similarly, ventilation is unlikely to succeed as the prime means of protection for people in close contact in a small space like a private office.
Creating Outdoor Air Inside
Rather than a requirement that will lead to increasing the power of existing HVAC systems and attaching a filter, OSHA could allow an exemption for healthcare facilities that deploy modern technologies, such as advanced photocatalysis, an updated and improved version of photocatalytic oxidation, or PCO. As Fei He of Pohang University of Science and Technology in South Korea wrote recently in the journal Nature:
PCO is proposed as an ideal technology for air purification because it can degrade diverse air pollutants into non-toxic or less harmful forms using solar (or artificial) light under ambient conditions. The photocatalyst (PC) process has some intrinsic similarity to the self-cleaning mechanism in Earth’s atmosphere in that both are based on indirect (sensitized) photooxidation to generate in situ oxidants in air.
Rather than bringing outdoor air inside through a mechanism that consumes large amounts of energy, PCO recreates indoors the organic process that continuously occurs in outdoor air to cleanse the atmosphere. Each breath of outdoor air contains billions of oxidative particles, which are the atmosphere’s primary self-cleaning mechanism. These particles continuously break down pollutants. But without sunlight indoors, cleansing particles are normally missing from interior environments.
Advanced photocatalytic technology restores the naturally occurring oxidizer particles to levels that will inactivate pathogens. The technology improves on simple PCO with a proprietary reactor that speeds up the process and avoids the generation of ozone and volatile organic compounds that have plagued earlier versions of PCO.
The Missing Data on Delta
“Where the hell are the data?” said the headline on an Aug. 9 Axios report, which continued, “Biden administration officials are growing frustrated with the lack of internal visibility into data being collected by the CDC, particularly as they try to deal with Delta’s spread.”
It's true that U.S.-based research on the new variant is limited. But the study we referred to above, by Jamie Lopez Bernal of Public Health England, et al., published in the NEJM, does examine the effectiveness of vaccines against Delta in the United Kingdom. The Pfizer-BioNTech vaccine, administered in two doses, was 88% effective in preventing infection by Delta; the Astra Zeneca vaccine was 67% effective. This U.K. study did not test Moderna.
A new Mayo Clinic study, not yet published in a peer-reviewed journal but released as a pre-print on Aug. 6, had findings regarding the Pfizer vaccine that were at odds with the U.K. research. Both the Moderna and Pfizer vaccines were “highly effective” in earlier research by Mayo, with Moderna 86% effective against infection and 92% effective against hospitalization and Pfizer in the same range. But in July, with Delta rampant (a prevalence of 70%), Moderna’s effectiveness against infection fell to 76% and Pfizer’s to 42%.
Meanwhile, a South African study, taken during high Delta prevalence, found that the J&J vaccine, which was administered to 477,000 health care workers in the country, was 91% to 96% effective in preventing death and 71% effective in preventing hospitalization.
In a separate study, also published Aug. 6 in MMWR, researchers found that among “Kentucky residents who were previously infected with SARS-CoV-2 in 2020, those who were unvaccinated against COVID-19 had significantly higher likelihood of reinfection during May and June 2021,” when Delta was becoming widespread. If you had COVID before and did not get a vaccination, you were 2.3 times more likely to get COVID again, compared with those who were vaccinated.
The Kentucky study follows this report on July 14 in JAMA:
After an infection with SARS-CoV-2, most people—even those with mild infections—appear to have some protection against the virus for at least a year, a recent follow-up study of recovered patients published in Nature suggests. What’s more, this and other research demonstrates that vaccinating these individuals substantially enhances their immune response and confers strong resistance against variants of concern, including the B.1.617.2 (delta) variant.
The Dreaded Third Tier
Vaccines appear to be doing a good job battling the Delta variant, but, with unvaccinated people providing a breeding ground, the virus can be expected to continue to mutate. The U.S. Government has developed a three-tiered classification system for variants, and, so far, no COVID-19 variant is in the top tier, “variants of high consequence.” Such a variant, says an American Chemical Society website, “is defined by failure to be detected by diagnostics, significantly reduced susceptibility to vaccines or other therapies, and more severe clinical disease (i.e., increased hospitalizations) above the levels described for the lower tiers.”
The second tier, called “variants of concern” and home to the original SARS-CoV-2 virus discovered in Wuhan and the Delta variant, is bad enough, but, as we have seen, it is highly susceptible to vaccines. A mutation could, however, produce a variant that qualifies for the third tier. The good news is that the proper tools to fight interior spread should be able to inactivate any new variant as quickly and easily as they can the current COVID-19 virus and other pathogens, which, by the way, tend to be even more difficult to tackle than an enveloped RNA virus like SARS-CoV-2.
As U.K. Cases Spike, Can the U.S. Be Far Behind?
Public health officials in the U.S. are looking to the U.K. with trepidation. Cases of COVID-19 there have soared from a seven-day average of 2,000 on May 4 to 37,000 on July 15, and the curve keeps rising almost vertically. U.K. Health Secretary Sajid Javid said on July 12 that cases could rise to 100,000 a day in the coming weeks, breaking the record of 60,000 set in January. The culprit, of course, is the highly contagious Delta variant.
What is disturbing for Americans is that the U.K. has actually been more successful vaccinating its residents than the U.S. has been. Some 52% of the population in the U.K. is fully vaccinated, compared with 48% in the U.S., and 69% of residents have received at least one dose, compared with 66% in the U.S. And the U.K. isn’t the only country with a recent spike despite an above-average vaccination rate. In Spain, where 48% of the public is fully vaccinated, cases have jumped 252% in two weeks to levels similar to those in January. Italy, France, and Germany, where vaccination rates are slightly lower, are also seeing significant increases.
The question now is whether American cases will follow the same pattern – that is, heading for another peak just when we thought that vaccines were depressing the virus for good.
Currently, U.S. cases are on the rise in every state – more than doubling over the past two weeks. Levels are still relatively low compared to the U.K., but it’s hard to tell what’s really happening because daily testing has dropped by half since April. Cases are rising especially in the South, and hospitalizations are up sharply in the last two weeks: more than tripling in Florida and doubling in Arkansas, Louisiana, and Missouri. The red counties in the map below indicate counties where hospitalizations have risen at least 20% in a week.
So far, the dramatic rise in cases in the U.K. has not caused a similar increase either in deaths or hospitalizations. During the last surge, deaths topped 1,000 a day; currently, deaths are fewer than 40 a day, though increasing. A high proportion of those getting sick from the SARS-CoV-2 virus are young people, nearly all of whom have not been vaccinated. Young people are less likely to get very sick and die from COVID-19, but, of course, they can spread the infection to more vulnerable seniors.
Despite all the cases, the U.K. dropped almost its legal COVID restrictions on July 19. Nightclubs, for example, were allowed to open for the first time since March 2020, and legal requirements for masking in enclosed public spaces were removed. Venues with crowds are being encouraged to require passports proving vaccination. There’s a growing belief globally that COVID is not going away any time soon.
Dr. Birx Expresses Virus Worries to County Officials at DC Conference
In the U.S., we will know very soon whether a genuine surge is at hand or whether cases will rise, as they did in April, and then quickly fall again. Deborah Birx, the physician and research scientist who served as leader of the U.S. battle against global HIV/AIDS and then as Coronavirus Task Force Coordinator, is worried. She is particularly focused on what happens as Americans move indoors, as they are now doing in the South and Southwest as summer heat intensifies; then later when school openings begin in late August; and, finally, as temperatures cool and people crowd interior spaces all over the country.
Birx spoke July 9 at a conference center outside Washington to attentive local officials from throughout at the country who were hungry for information about the course of the virus. Her remarks came at a meeting of the National Association of Counties (NACo). Birx took a new role in March as chief medical and scientific advisor to ActivePure, the Dallas-based developer of technologies to make indoor air cleaner and safer. She is especially concerned about mitigating indoor spread, not just of the SARS-CoV-2 virus, but also of other respiratory pathogens.
County officials at the NACo conference were naturally focused on the American Rescue Plan, which became law in March and allocates $1.5 trillion in county-related funding (NACo provides a breakdown). Some $130 billion is going to help schools reopen in the fall, including by purifying classroom air. Separate funds can be used by state, county, large-city, and tribal governments for “prevention, mitigation or other services in congregate living facilities or schools” (again, including by purifying the air) and for the safety of air in “key settings like health care facilities.”
The county officials are trying conscientiously to find the most effective, safest technologies to mitigate SARS-CoV-2 and other pathogens, while also protecting the environment. But making the right choices is not easy. As we have previously noted, a good guide was provided in an article by former Acting Surgeon General Kenneth Moritsugu posited in an article we cited in our newsletter No. 6. The original piece appeared on the RealClearHealth site on May 20, and its aim was to help government and education officials, as well as owners of private businesses and facilities managers that have to decide the best way to mitigate the dangers of SARS-CoV-2 and other pathogens
‘She Saved Thousands of Lives’
Dr. Birx was highlighted in an article in the latest issue of the academic journal Regulation by David Harrington, the Himmelright Professor in Economics at Kenyon College. Harrington wrote:
During the final months of [Donald Trump’s] presidency, [Birx] spent most of her time on the road, traveling from state to state, meeting with governors, university presidents, public health officials, and reporters. She delivered an urgent message to everyone who would listen: COVID is surging; it’s insidious and dangerous; and people need to start guarding against it now.
Her travels create a unique opportunity to estimate whether people were heeding her advice. More specifically, the variation in where and when she made her recommendations can be compared to outcome variables such as whether people were wearing masks. As you’ll see, the evidence convinces me that she saved thousands of lives.
Harrington referred to Birx as a kind of “Johnny Appleseed,” travelling to “nearly every state on the continent, enduring “danger and drudgery,” and offering “hard recommendations wrapped in compliments.”
His research found that “Birx nudged 14.5% of those reluctant to wear masks to do so. If someone like her was just as successful in nudging people to get vaccinated, the hesitancy rate in states Trump won would decrease from 21% to 18%.”
The Biden Administration, wrote Harrington should consider having someone like Birx “visiting with governors and the American people to talk about receiving the COVID vaccine and taking care not to relax mitigation strategies too rapidly as the virus’s infection and death tolls fall…. An official filling the role Birx did last year would certainly be helpful.”
Harrington warns that “there is still elevated public health risk, exacerbated both by virulent new strains of the disease and a significant chunk of the public’s hesitancy (and in some cases outright opposition) to receiving one of the vaccines.”
For her part, Birx is continuing to talk to state, local, and university officials, both at venues like the NACo conference and on dozens of Zoom calls
A Respiratory Virus That Strikes Infants and Seniors Is Surging,
and It’s Not COVID
As masks come off, conventional respiratory infections are increasing. The Centers for Disease Control and Prevention (CDC) reports a huge spike, starting in mid-March, in cases of respiratory syncytial virus (RSV), which is especially dangerous for infants and older people.
Mask-wearing to protect against contracting COVID has been shielding us from other viruses, like the flu, as well. Now we are back where we started – in interior spaces where ventilation, even with filters, is inadequate protection.
Actually, we may be worse off. A July 8 article in The Guardian notes that hospital wards in New Zealand are being “flooded by babies with a potentially-deadly respiratory virus,” a reference to RSV. The reason is what’s called “immunity debt.” Children have not built up the usual protections because they “haven’t been exposed to a range of bugs due to lockdowns, distancing, and sanitizer, [so] their immune systems are suffering.”
The article points out that in New Zealand, “lockdowns last winter led to a 99.9% reduction in flu cases and a 98% reduction in RSV.” According to a May 2021 study of immunity debt by a group of French doctors, “This positive collateral effect in the short term is welcome, as it prevents additional overload of the healthcare system,” In the long term, however, says the Guardian article, “if bacterial and viral infections aren’t circulating among children, they don’t develop immunity, which leads to larger outbreaks down the line.”
Immunity debt will almost certainly lead not just to more infections but to confusion and deep concern when people come down with respiratory symptoms as the weather gets colder. They’ll wonder, even if they are vaccinated, whether they have COVID. One way to alleviate both the infections and the worries is by taking measures to reduce the spread of pathogens indoors through ventilation and air purification.
Climate Endangered as HVAC Systems Draw More Power to Mitigate COVID, Writes Former Sierra Club Board Member
In an opinion piece in Newsweek on July 14, Michael Dorsey, an environmental scientist and former director of the Sierra Club, warned of the dangers to the climate from ramping up HVAC systems and adding high-efficiency filters to them in an effort to mitigate threats of COVID-19 indoors.
Instead, Dr. Dorsey, who is also a former director of Dartmouth College’s Climate Justice Research Project and earned his PhD in natural resource and environmental policy at the University of Michigan, recommends “advanced photocatalytic,” or AP, processes as “better solutions” for cleaning interior air while avoiding increased energy use. He writes that the AP “methodology uses sub-microscopic particles in a super-charged state” to deactivate pathogens, “avoiding massive energy consumption” that is caused “by the process of sucking air through a filter or using harmful ultraviolet light.”
Dr. Dorsey takes aim at ASHRAE, the American Society of Heating, Refrigerating and Air-Conditioning Engineers, whose advice, he writes, “is a recipe for driving up CO2 emissions, and simultaneously runs afoul of long-standing guidance for green buildings practices.” ASHRAE has urged property managers to consider keeping their HVAC systems running 24 hours a day. The group also recommends applying filters, which can cause major pressure drops to systems, in turn necessitating more power to maintain ventilation levels.
The article cites a piece last year in the Wall Street Journal with the headline, “Why Covid-19 Makes It Harder for Cities to Fight Climate Change.” The article noted, “In a recent study, real-estate technology company Enertiv found that HVAC costs in office buildings increased 36% during the pandemic” because of increased energy use.
The Journal article also stated:
Landlords in some cities face not just higher energy bills, but also steep fines. In New York, the country’s largest office market, the city council last year passed a bill that set emission caps for buildings with a goal of reducing carbon emissions 40% by 2030, compared with 2005 levels. Starting in 2024, some building owners that fail to reduce emissions face fines of as much as millions of dollars a year.
On the other hand, said the article, paraphrasing Brenden Millstein, CEO of Carbon Lighthouse, a firm that helps building owners cut emissions, “landlords face potential lawsuits if tenants in their buildings become infected and a court determines that negligence has occurred,” so “the key is finding a balance.”
Dorsey sees that balance being achieved, not through enhancement of HVAC systems but through adding technology like AP, which was developed by ActivePure, a Dallas-based company. The U.S. Food & Drug Administration last year cleared ActivePure’s Medical Guardian, a device that uses the same technology as its other products, as a Class II Medical Device.
The Newsweek article concludes:
We can’t roll back 50 years of progress in sustainable building practices by simply telling property owners to run their HVAC systems more…. Advanced photocatalytic technologies can give us the best of both worlds. If we pursue a smart approach, we can emerge from COVID-19 healthier, reducing emissions and ultimately [becoming] more sustainable.
In Newsletter No. 5, we cited an article in HPAC Engineering by Gary and Ken Elovitz, a father and son team with Energy Economics, a venerable consulting firm outside Boston. The authors are skeptical of ventilation -- that is, the exchange of indoor for outdoor air through a heating and cooling, or HVAC, system – as the sole method of mitigating the spread of the SARS-CoV-2 virus, which causes COVID-19. They write:
The biggest danger for COVID-19 infection is close-range contact with infected people who are talking loudly or are otherwise exhaling heavily for at least several minutes. The HVAC system does not have much effect on those conditions.
The authors use the Wells-Riley equation, which uses “infectious particle concentration, exposure time, and outside air ventilation” to come up with a prediction of the “likelihood that a person will be infected by a virus.” (Academic research shows that, if anything, Wells-Riley underestimates risk.) Plugging in the numbers, the Elovitzes conclude:
No practical amount of ventilation can be relied on or expected to protect occupants over long exposure times like the 6 or 8 hours people might spend together in an office or school classroom. Similarly, ventilation is unlikely to succeed as the prime means of protection for people in close contact in a small space like a private office.
The authors write that “improved filtration can reduce the risk of transmission by reducing the concentration of infectious particles in the air.” But that reduction is by no means complete. They write that, on average, “MERV 13 filters might be 60% to 70% efficient at removing particles that contain viral material.”
Like Dr. Dorsey, the authors also warn that higher-efficiency filters “have higher pressure drop,” which means reduced air flow and heating and cooling capacity. Bringing an HVAC system back up to its pre-filter levels of air flow requires an increased “motor load” – that is, a bigger-capacity system, which will use more energy and pose a greater threat to the environment.
Study Finds Delta Variant ‘Highly Transmissible in Indoor Sports Settings’
The Tokyo Olympic Games begin on July 23, and, while spectators have been banned because of COVID-19 concerns, athletes are already testing positive. Indoor events could become breeding grounds.
On July 16, the CDC’s Mortality and Morbidity Weekly Reports (MMWR) presented an examination of an outbreak at a U.S. gymnastics facility caused by the B.!.617.2 Delta variant, which originated in India and has spread around the world. The study concluded that the variant is “highly transmissible in indoor sports settings and households.”
Researchers from the Oklahoma Department of Health found that 47 people were infected out of 194 people exposed in the April-May event, including both gymnasts and family members. Among the 133 gymnasts themselves, 26 were infected.
“Several potential risk factors for transmission were identified through household interviews and direct observations at facility A,” wrote the researchers, “including nonadherence to recommended quarantine and testing guidance; delayed recognition of infection because of mild symptoms or attribution of symptoms to other causes; not using masks among active participants, coupled with increased respiration during active sport participation.”
No doubt “increased respiration” will be hard to avoid when the Olympics begin. The researchers urged, in addition to vaccinations, “multicomponent prevention strategies (e.g., testing, symptom monitoring, and other setting-specific measures)…among persons participating in indoor sports and their contacts.”
There was no specific mention, however, of one of the best ways to prevent the spread of the virus indoors: steps to keep interior air clean and safe through, for example, ventilation coupled with advanced photocatalysis.
Public Health Leaders Urge Expanded Testing and Research
Writing in JAMA on July 15, three public health leaders took issue with the decision of the CDC in May to focus “its surveillance efforts only on breakthrough infections that resulted in hospitalizations or deaths, and ceasing to document [other] asymptomatic or symptomatic breakthrough cases.” (The term “breakthrough” refers to a COVID-19 infection in someone who has been vaccinated.)
The authors -- David Holtgrave, dean of the School of Public Health at the State University of New York at Albany; Sten Vermund, dean of the School Public Health at Yale; and Leana Wen, former health commissioner of Baltimore – wrote that the CDC “should once again add symptomatic infections to its surveillance efforts for breakthrough infections.” Recording these cases will help policy makers learn the extent of “suboptimal” vaccine protection. “Such symptomatic cases are relevant to the nation and should be reported by CDC.”
The authors point out that vaccinated people who are infected “may have more potential to transmit SARS-CoV-2 to others.” This is precisely the problem we may see at the Olympics or in the U.S. as school begins and people go back to office work.
Breakthrough infections currently happen at a low rate. For example, a study of 1,843 health care personnel, published in the MMWR in May, found that, of 623 case patients with a positive COVID test, only 19, or 3%, had received two vaccine doses. But, write the authors, “given the very large number of vaccinated persons in the U.S., even a small fraction of a large population can still represent a moderate number of cases.”
While finding and publicizing even the small proportion of breakthrough cases could alarm the public, if the CDC does not look for those cases actively, it will not have much authority when it asserts that the cases are rare. The authors, therefore, urge the CDC to step up testing of both vaccinated and unvaccinated Americans, which, as we noted above, has trailed off at an alarming rate.
Holtgrave, Vermund, and Wen also call for more research to understand why the case fatality rate (CFR) has been flat over the past six months. CFR is the number of COVID-19 related deaths divided by cases – in other words, the chances that, if you get infected, you will die. Since December 2020, “the CFR for the U.S. has hovered at approximately 1.7%” (actually, it rose a bit to 1.8% in the second week of July) despite the fact that, “given the array of tests, vaccines, and treatments now available, the CFR might be expected to be declining over time.”
The authors write that it’s important to learn whether people receive a diagnosis early in their illness and whether they have access to the right treatments. They urge expanded research into the role that income inequities and other social determinants play in treatment.
They conclude, “The nation’s confidence in the overall COVID-19 response is only as strong as its COVID-19 surveillance system, which should continue to persistently and rigorously look for trouble even if everyone hope there is little trouble to be found.”
Most Americans Still Not Fully Vaccinated
As Variants and Heat Rise Across Nation
The U.S. is unlikely to reach President Biden’s goal of having 70% of adults vaccinated for COVID-19 by July Fourth, but we’ll be close – an estimated 68%. The seven-day average for coronavirus cases has dropped to 11,672 as of June 24, the lowest figure in 15 months, and deaths are down to 314, or an average of six per state, a decline of more than 90% since the January peak.
But serious threats remain:
Dormant or Resurgent
We may not be getting good data, either. There has been a big decline in testing: just 500,000 on June 14, compared with 1.8 million on April 1. A lot more people could have COVID than we know, including people who have been vaccinated but have asymptomatic infections and can spread the disease further. In addition, the CDC is no longer tracking transient infections.
Also, understand that the proportion of Americans over age 18 with at least one shot, currently 66%, isn’t the whole story. The figure for all Americans who are fully vaccinated (two Pfizers or Modernas, or one J&J) is 45%. And in lightly vaccinated states, especially, cases are on the rise. According to CDC data, the states with the highest number of new cases per 100,000 over the past seven days are, in order: Missouri (far and away the worst), Wyoming, Utah, Nevada, Arkansas, Florida, Louisiana, and Colorado.
The essential question is whether the pandemic is dormant and will reemerge in the late summer and fall – when we will have a difficult time reviving mask-wearing and distancing measures -- or whether we have beaten it down for good. But when it comes to mitigating interior spread of the virus, it really doesn’t matter. Even if the SARS-CoV-2 bug leaves, there are many others that need addressing.
As COVID Falls, Other Illnesses Rise
As the pandemic is waning, a new and surprising problem is arising: Americans are getting sicker with non-COVID diseases. We know because of data gathered by California-based Kinsa, a young tech firm that has developed a network of two million smart thermometers that provide early-warning notice of illness around the country.
Kinsa recently took a close look at Texas, as a possible harbinger: “On March 10, 2021, as any other states braced for another wave of the epidemic, Texas took the bold steps of lifting mask mandates and removing other precautionary measures designed to slow the spread of COVID-19.”
COVID cases continued to decline after March 10 in Texas, although at a slightly slower rate than before. But something else happened:
Following the loosening of restrictions, Texas experienced the highest levels in Kinsa’s overall illness signal in more than a year, driven not by COVID, but by other common contagious illnesses like strep, RSV and even some flu, according to diagnostic data.
Especially alarming in Texas has been the sharp increase in RSV, or respiratory syncytial virus, which produces only mild symptoms that last about one or weeks in most people but can be dangerous to infants and the elderly. RSV positivity soared from 0.1% of tests in early April to over 5% by late May, according to Kinsa. The Centers for Disease Control (CDC) notes that “RSV is the most common cause of bronchiolitis (inflammation of the small airways in the lung) and pneumonia (infection of the lung) in children younger than one year of age in the United States.”
The precautions taken to prevent COVID also prevented other infectious diseases, but when those precautions were lifted, the other illnesses spiked. From late March to early May, for example, the total Texas population with a fever rose from 0.4% to 1.5%. “Though [it is] initially alarming to see so much illness,” writes Kinsa’s Matt Albasi, “this is simply a return to normal…. The road back to normal is paved with illness.”
While much of the media is missing this story, an article in STAT News last month predicted a resurgence in non-COVID viruses -- “perhaps a big one.” The piece, on May 27, quoted Ben Cowling, an infectious disease researcher at Hong Kong University saying, “When they come back there’s going to be vulnerability and probably greater levels of infections.”
In an Axios piece on June 7 with the headline “America’s Next Big Wave of Sick,” Ryan Langlois, associate professor in the microbiology and immunology department at the University of Minnesota, made the point that “you’ve lost one pathway to immunity, which is natural infection” from the previous flu season, when people were masked and socially distant and flu was at the lowest levels on record. "We’ve never been in this situation."
Improving Indoor Air as an Antidote
But should the road back to normal be “paved with illness”? While we can’t expect mask-wearing to persist, now appears to be the time for those responsible for schools, office buildings, hotels, restaurants, theatres and all indoor spaces to improve the quality and safety of indoor air. Two lessons from the COVID pandemic are that, first, this pathogen, like nearly all pathogens, spreads most effectively through indoor air, and, second, our indoor air is not nearly as clean and safe as it should be.
This unclean and unsafe air might be seen as an indictment of the ventilation industry, whose HVAC systems do a good job of keeping rooms at a comfortable temperature but, we are learning, have been inadequate to prevent disease.
These two lessons about interior air should also be seen in the context of a changing environment of public awareness. The pandemic has made people much more conscious of the air around them, and they are almost certain to demand its improvement – COVID or no. The good news is that the funds that the federal government is providing states and localities to battle airborne SARS-CoV-2 in schools and other buildings will also support combatting other pathogens.
If you deploy the right technology, the COVID virus, in fact, is among the easiest pathogens to inactivate because it is an enveloped virus with a vulnerable shell. Harder to kill are non-enveloped viruses, bacteria, and mold spores.
A Future 'New Norm' in India
India has had a rough spring, mainly because of variants and a lack of vaccinations, but in the past two weeks, new cases of COVID-19 have dropped 49%. The experience inspired Rachna Aggarwal to imagine a future world that’s changed because of the pandemic. In the venerable daily New Delhi-based national newspaper The Pioneer, Aggarwal wrote on June 21:
Air purification systems which regulate the PM [particulate matter] level of air are now passe; we must upgrade to technologies that can eliminate biological aerosol contents from the air…. The recent turn of events will bring in a ‘new norm’ wherein air quality certification will be required to gain people’s trust.
Will the public want to enter any building whose air isn’t trusted, in India or anywhere else? It’s doubtful.
‘Meeting Code’ Is Not Enough, Says Harvard’s Allen
Joseph Allen, an expert on interior environments at the Harvard T.H. Chan School of Public Health, puts the situation well, “If you’re still feeling uncomfortable or anxious, that’s totally understandable. “This pandemic has affected all of us in profound ways, and people are going to be ready to re-enter life again or re-enter interacting with people at different times.”
Quoted in a June 11 New York Times article, Allen advised, “One thing you can do before you go back to work is simply [to] ask them what they’ve done. And if you hear things like, ‘Yes, we’re meeting code,’ then that’s a flag that something’s not right. They should be going above and beyond the bare minimum ventilation and filtration rates.”
The article continued:
Although the ideal ventilation rate varies, in general, employers should maximize the amount of fresh air coming in from outdoors, he said. In a relatively small space — say, the size of a typical school classroom — employers should aim for four to six air changes per hour, meaning that the air inside the space is being completely refreshed every 10 to 15 minutes.
Few HVAC systems produce such vigorous air changes, and upgrading a system to do so, as well as to carry heavy-duty filters, means added power – and potentially added damage to the environment. One good solution is supplementing ventilation with air-cleaning technologies that can either be added to an HVAC system without causing a pressure drop or arrayed in stand-alone devices.
Confidence and Caution: ‘This is Not Just a COVID Thing’
In an article headlined, “Consumer expectations: Restoring confidence in the travel experience,” Adam Perkowsky of HotelBusiness.com wrote that hoteliers and guests are, of course, concerned about “air quality as it relates to the transmission of COVID-19 particles and other airborne pathogens.”
The piece quoted one industry expert as saying, “This is not just a COVID thing. The links between air quality and cognition and susceptibility for long-term disease are supported by years and years of research. The pandemic was an ignition switch to raise awareness that what we breathe matters—that indoor air quality is oftentimes a lot worse than outdoor air quality and that needs to be addressed.”
Actually, it is rare that indoor air quality is not worse than outdoor air quality. The aim of the best air purification systems is to produce chemical changes to render indoor air as clean as outdoor, which has the advantage of solar cleansing.
Unfortunately, while many devices make claims, few are effective and safe enough to have 501k FDA clearance as a Class II Medical Device. One that does have such clearance is the Medical Guardian, which deploys the same Advanced Photocatalysis (AP) technology used in all products made by Dallas-based ActivePure, whose corporate roots go back nearly a century. AP technology evolved from photocatalytic oxidation (PCO), a process which, unlike proprietary AP, can, in its more rudimentary early forms, generate ozone and volatile organic compounds (VOCs).
New purveyors of air-cleaning products are popping up, and the HotelBusiness article urges caution: “There are so many gimmicks out there. [There is a] need to separate fact from fiction as it relates to manufacturers’ claims on what their units can do.”
An article in a Missouri newspaper on June 21 noted that Kansas City schools purchased devices that rely on technology that involves emitting ions that cause particles in the air to cluster, which, the manufacturer says, makes them easier to trap in an HVAC system. The company behind the technology, says the article, “is facing a federal lawsuit filed by a consumer who bought one of its devices, alleging the company ‘continues to defraud consumers by concealing material information regarding the true performance’ of its products.” (The company says the suit is baseless.)
In another example, a study by researchers from Colorado State University, Portland State University and the Illinois Institute of Technology found that in chamber and field tests “an ionizing device led to a decrease in VOCs [such as] xylenes, but an increase in others, most prominently oxygenated VOCs (e.g., acetone, ethanol) and toluene, substances commonly found in paints, paint strippers, aerosol sprays and pesticides.”
A release issued by Colorado State about the study stated:
According to the EPA, exposure to VOCs has been linked to from eye, nose and throat irritation, headaches, loss of coordination and nausea, to damage to liver, kidney and central nervous system, and some organics can cause cancer in animals, some are suspected or known to cause cancer in humans. The study, published May 15 in the journal Building and Environment, mimicked real-world operating conditions for these ionization devices to test the effectiveness and potential to form chemical byproducts in environments similar to where we all live, work, and learn.
Former Surgeon General’s Advice
The reference to “real-world operating conditions” is important, and it reminds us of the set of five questions that former Acting Surgeon General Kenneth Moritsugu posited in an article we cited in our newsletter No. 6. The original piece appeared on the RealClearHealth site on May 20, and its aim was to help the many school, state, city and country administrators, as well as owners of private businesses and facilities managers that have to decide the best way to mitigate the dangers of SARS-CoV-2 and other pathogens.
Ventilation is part of the answer, but another layer of protection is needed. Here are the five questions from Dr. Moritsugu:
Survey Finds Big Mitigation Outlays With Limited Success
Reinforcing the need to ask the right questions is a recent survey of 430 facilities managers, reported June 23. It found that 60% improved their HVAC systems to battle COVID-19. But, according to a CleanLink article, “HVAC upgrades are quite expensive, typically costing more than $500,000 and in some cases as much as $5 million.” The survey found that managers “vastly underestimated” the cost of these improvements. The article continued:
Additionally, for an upgraded HVAC system to improve air quality, it must operate continuously while the building is occupied, which is very expensive. In other cases, businesses felt compelled to try relatively new and unproven ionization technologies, which are increasingly under attack from academics and government agencies for being ineffective and possibly dangerous.
The survey found that 60% of surveyed companies spent more than $500,000 upgrading or installing HVAC systems and that nearly all respondents took some kind of measure to stop interior spread. But, said the article, the survey found that the managers “often made subpar investments, spending millions of dollars with limited success.”
Said Paul de la Port, the CEO of Omni ClearAir, a commercial manufacturer of air purification systems and sponsor of the survey: “The noisy environment, lack of transparent and easily understood real-world efficacy data, and unscrupulous COVID-19 opportunists appear to have clouded the landscape so much that many businesses simply were unable to make informed investment decisions about indoor air quality solutions.”
He added, “What many businesses don’t realize is that HVAC systems, even when they can eliminate the virus, require large amounts of electricity to operate, so the long-term cost will be very burdensome and the resulting air often won’t be adequately cleaned.”
In this issue:
“We expect clean water from the taps. We expect to have clean, safe food when we buy it in the supermarket. In the same way, we should expect clean air in our buildings and any shared spaces,” said Lidia Morawska, an aerosol physicist at Queensland University of Technology in Australia. She was one of 39 scientists, including Joseph Allen of Harvard and William Bahnfleth of Penn State who, writing in Science magazine on May 14. called for a “paradigm shift” in the way policy makers and individuals think about the quality of indoor air.
In a New York Times article, Aporova Mandavilli called the Science magazine article “a manifesto of sorts” and noted, “The pressure to act on preventing airborne spread has recently been escalating.” She wrote: “Clean water in 1842, food safety in 1906, a ban on lead-based paint in 1971. The sweeping public health reforms transformed not just our environment, but expectations of what governments can do.”
COVID-19, of course, was the catalyst for this new interest in clean interior air, but the need for mitigating pathogens extends well beyond the end of the pandemic. The failure to address airborne dangers is not merely regulatory. Large companies engaged in ventilation bear a good deal of the blame as well because the technology exists to mitigate the problem. It is just not being applied. The Science manifesto states:
Airborne pathogens and respiratory infections, whether seasonal influenza or COVID-19, are addressed fairly weakly, if at all, in terms of regulations, standards, and building design and operation, pertaining to the air we breathe. We suggest that the rapid growth in our understanding of the mechanisms behind respiratory infection transmission should drive a paradigm shift in how we view and address the transmission of respiratory infections to protect against unnecessary suffering and economic losses. It starts with a recognition that preventing respiratory infection, like reducing waterborne or foodborne disease, is a tractable problem.
Questions for Officials (and the Rest of Us) to Ask Before Buying Devices to Mitigate the Spread of Airborne Virus
In the U.S., COVID-19 cases are falling, but more than 140,000 Americans were infected last week, and public health authorities have at last recognized that the main culprit is interior spread of the SARS-CoV-2 virus. The federal government is allocating billions of dollars to state and local government for mitigation efforts inside buildings.
The American Rescue Plan, signed into law March 11, includes $130 billion to help schools reopen in the fall. That money can go to such uses as reducing class sizes, purchasing personal protective equipment, and buying devices to prevent interior spread of the COVID-19 virus through the air.
On May 10, the U.S. Treasury specified the way that a separate tranche of $350 billion in Coronavirus State and Local Fiscal Recovery Funds under the Rescue Plan may be used by state, county, large-city, and tribal governments. One of those uses was “prevention, mitigation or other services in congregate living facilities or schools”; another was addressing the safety of air in “key settings like health care facilities.”
Imagine you’re a public school, university, or hospital administrator. Or a mayor, county executive, or governor. Or someone in charge of a childcare or senior facility or recreation center. The federal government has bestowed millions or billions of dollars on your office – a windfall of enormous importance. You want to spend a significant portion of the funds on protecting citizens against airborne and surface SARS-CoV-2 and other pathogens, but how do you decide which technology is best?
In a RealClear Health article on May 20, former Acting Surgeon General Kenneth Moritsugu, tackled the problem by providing a set of five questions that officials and other purchasers should be asking. Moritsugu is a retired Rear Admiral, a physician and public health administrator who was the first Asian-American to serve as Surgeon General.
“Demand for equipment that can help mitigate and prevent the spread of COVID has exploded,” he wrote, “but don’t buy in a panic. Ask the right questions and invest in the technologies that are best suited for the specific need, based on science and proven evidence. Good choices made today can help keep students and others safe from COVID-19 and other viruses, bacteria, and molds.”
Here are the questions that purchasers of equipment should ask:
Moritsugu notes that, “while improved ventilation systems can help, conventional air filters try to trap pathogens but may miss a large proportion of virus-sized particles. Look for technologies with filters that work at the viral level or deploy microscopic particles to search and destroy pathogens in the air and on surfaces rather than just trying to filter them out.”
He also points out that to “use ultraviolet (UV) light to deactivate COVID viruses, the light has to be so strong that it could damage the retina – which is why surgical theaters are cleared when UV is utilized. Other systems, especially those using outdated version of photocatalytic oxidation (PCO), generate ozone and toxic byproducts. Be sure to ask for data and evidence that a system is safe.”
That last point is critical. Very few devices are equipped with technology that has FDA clearance, and few companies that sell equipment can provide testing data. Be demanding. Lives are at stake.
‘A Wave of Liability Claims’ for COVID Infection Is Expected
An article published in Risk & Insurance, a trade journal, says that business interruption cases, which were popular in the early stages of the COVID pandemic, are being replaced by “a wave of liability claims [that] is rolling in.” Says the piece: “Though plaintiffs will have a tough time blaming businesses for exposure to the virus, [insurance] carriers are nonetheless prepping defense strategies and emphasizing risk mitigation to clients.”
The reporter, Kate Dwyer, writes, “Of course, the best way to limit exposure to liability claims and ensure an expeditious closure to any that do come forward is to keep premises as safe as possible.” She quotes Stephen Jones of Praedicat, a data firm, as predicting that “COVID-related liability litigation could reach roughly $19.6 billion, with another $1.4 to $3.8 billion in associated securities lawsuits.”
In a piece on Bloomberg Law’s Daily Labor Report, Chris Marr concurs: “Business groups fear [a] flood of lawsuits as yet unseen.”
Liability Shields in the States Vary Widely
Many states have offered protections to businesses through liability shields. While some of these laws are close to expiration, others are being extended as the disease continues to afflict Americans. Florida, Oklahoma, and West Virginia have even enacted shields with no expiration date.
The Florida law, signed March 29, is particularly favorable to businesses. If a business makes a “good faith effort to substantially comply with authoritative or controlling government-issued health standards or guidance at the time the cause of action accrued,” then the business is immune from liability. Under South Dakota’s law, plaintiffs can only bring cases if they get sick as a “result of intentional exposure with the intent to transmit COVID-19.”
About half of all states have extensive COVID liability shields. They are mainly in the South and Midwest, and nearly all have Republican legislatures. States with limited shields, or none at all, are concentrated in the Northeast and West Coast but also include Illinois, Minnesota, and Colorado, according to a Bloomberg Law analysis. Rhode Island, for example, extends ample protections to health care workers but “not all businesses are insulated,” writes attorney Samantha Vasques of the firm Locke Lord.
In a May 11 article, Vasques cites Tennessee’s law as typical. It…
…provides that individuals or businesses cannot be liable for loss, damage, injury, or death that arises from COVID-19 unless the party filing suit against them proves by clear and convincing evidence that they caused the injury by an act of omission constituting gross negligence or willful misconduct.
Marr quotes Thomas J. Mew, a plaintiffs-side employment lawyer in Atlanta as saying that places such as nursing homes face a bigger risk of litigation. “From a practical level,” he said, “it’s generally going to be challenging to prove that one contracted COVID-19 at a particular place,” especially one that a customer visits for only a few minutes or an hour.
Still, said Ashley Cuttino, a Greenville, S.C., lawyer, we are seeing virus-related liability suits. “We’re just not seeing tens of thousands of them.” Cuttino said that the shield laws are working to limit lawsuits “and get businesses reopened in a safe manner.”
Rumrill v. Princess Cruise Lines Ltd., filed in April 2020, was of the earliest cases. Cited in the Risk & Insurance article, it involved a couple that claimed they contracted COVID on a ship because of the cruise line’s “lackadaisical approach to safety.” A federal judge tossed out the case but let the plaintiffs amend their suit. Wrote Dwyer:
To build a stronger argument, the couple must demonstrate they were likely exposed on the ship given the exact date they began experiencing symptoms and the virus’s incubation period. Building that link between time of exposure, incubation period and symptom onset would be “a key fact necessary to render the causation allegations plausible, not merely possible,” the judge said, essentially laying the foundation for future plaintiffs’ arguments.
Dwyer concludes, “Insurers expect this type of claim to increase in frequency as restrictions continue to loosen and courts open back up.”
In Schools, a Policy of Ventilation-Plus Cuts COVID Cases
“To date, there have been no U.S. studies comparing COVID-19 incidence in schools that varied in implementing recommended prevention strategies,” such as mask wearing and improvements in air circulation and purification, write a dozen researchers from the Georgia Department of Public Health and the Centers for Disease Control and Prevention (CDC).
Those researchers set out to rectify that situation in a study published May 28 in Mortaility and Morbidity Weekly Report (MMWR), the indispensable publication of the CDC. Examining 169 schools with varying policies in Georgia between Nov. 16 and Dec. 11, 2020, they found that “COVID-19 incidence was 37% lower in schools that required teachers and staff members to wear masks and 39% lower in schools that improved ventilation.”
Researchers also look at schools that deployed “ventilation-plus” – that is, they augmented simple ventilation, which exchanges inside air for outside, with “methods to filter airborne particles with high-efficiency particulate absorbing (HEPA) filtration” or with or ultraviolet germicidal irradiation (UVGI). Ventilation-plus caused COVID-19 incidence to fall to 48% below incidence in schools with no air improvements. In other words, adding filtration or UVGI, increases the rate of mitigation over simple filtration by about one-fourth.
The authors conclude that “in rooms that are difficult to ventilate or have an increased likelihood of being occupied by persons with COVID-19 (e.g., nurse’s office), installation of HEPA filters or UVGI should be considered.”
Filtration is slow, and UVGI at high levels is dangerous for people. The research did not examine classrooms that used air cleaning or purification technology that goes beyond these methods, such as enhanced photocatalytic oxidation of the sort developed by ActivePure, a Dallas company that has installed its devices in many schools. This technology can inactivate much smaller particles, at much faster speeds, than filtration.
The authors urge “a multicomponent approach to school COVID-19 prevention efforts” and write that “universal and correct mask use among teachers and staff member and improved ventilation are two important strategies that could reduce SARS-CoV-2 transmission as schools continue, or return to, in-person learning.”
Adult Vaccinations in U.S. Seem to Be Hitting the Wall
More than half of U.S. adults are now fully vaccinated – a proportion exceeded only by Israel, Bahrain, and Chile and a remarkable achievement in just six months. But now, vaccinations are running into a brick wall. “Few who are eager to get a shot remain unvaccinated”: that’s the conclusion that the Kaiser Family Foundation is drawing from its latest survey, released May 28.
“Nearly all adults who are eager to get a COVID-19 vaccine now have already gotten at least one shot,” says KFF in a press release. The foundation’s latest polling shows that 62% of U.S. adults have gotten at least one dose – up just 6 percentage points from April. The share of those who say they want a shot “as soon as possible” dropped from 9% in April to 4% in April.
What’s particularly disturbing is that the proportion saying they will “definitely not” get a shot has been stuck at 13% in every monthly survey since January – and those saying “only if required” has been stuck at 7%. In other words, one-fifth of adults are adamantly opposed to COVID vaccination and haven’t changed their minds.
The proportion saying they will “wait and see” has dropped since January from 31% to 12%, but that number too seems to have stalled out. Also grim: KFF found that 40% of parents of children under 12 answered “definitely not” or “only if required” when asked if they would have their kids vaccinated.
Factors That May Accelerate Vaccinations
Two developments, however, could cause vaccinations to increase. First, Pfizer and BioNTech, developers of the first vaccine to receive Emergency Use Authorization from the U.S. Food & Drug Administration (FDA), last month asked for full authorization. The application process for a Biologics License normally takes about a year, but Pfizer is seeking a priority six-month review. Approval will allow the partners to market the vaccine directly to consumers.
It could also give greater confidence to vaccine-hesitant Americans whose reluctance, despite a flood of positive data, may be based on notion that they’re getting a treatment that has been given swift “emergency” approval rather than longer, more detailed consideration.
The second development is that more employers, schools, airlines, retailers, and other public institutions will start requiring vaccinations. But that change is far more likely to occur after full authorization of the vaccine. As the New York Times reported:
The University of California and California State University school systems, for instance, have announced that once coronavirus vaccines receive full F.D.A. approval, they will require students, faculty and staff members to be vaccinated. The U.S. military, which has seen many troops decline coronavirus vaccines, has said that it would not make them mandatory as long as they have only emergency authorization.
Still, anyone who is responsible for the safety of others should be aware that the U.S. is unlikely to reach herd immunity and as much as one-third of the population may never be vaccinated (the proportion today is 41%, according to Johns Hopkins University). In addition, Anthony Fauci, director of the NIH Institute for Allergy and Infectious Diseases, said on May 26 that booster shots will be needed as the effect of the initial vaccination wears off.
“Even with vaccination efforts in full force, the theoretical threshold for vanquishing COVID-19 looks to be out of reach,” said a recent article in the scientific journal Nature.
The COVID-19 virus or, at the very least, fears of its resurgence, will likely be with us for a long time.
The Problem of Virus Variants
Then, there is the problem of SARS-CoV-2 mutating into slightly different viruses that current vaccines cannot combat as effectively. “The emergence of variant strains is arguably the greatest threat to control of the Covid-19 pandemic,” says a piece in the May 20 issue of New England Journal of Medicine by Kathleen Neuzil of the University of Maryland School of Medicine.
The piece cites two recent peer-reviewed trials reported in the NEJM. They evaluated the performance of vaccines in battling the B.1.351 variant, first identified in South Africa. The variant “has shown evidence of increased transmissibility, a considerable reduction in neutralization by convalescent and postvaccination serum, and significantly decreased neutralization by monoclonal antibodies.”
One of the vaccines, AstraZeneca’s ChAdOx1 nCoV-19, “conferred no efficacy…against mild-to-moderate disease caused by the B.1.351 variant.” No severe cases were reported for either the vaccine or a placebo, so no conclusions could be drawn on that score. Overall, writes Neuzil, “the lack of efficacy against nonsevere disease…is disappointing,” especially because the AstraZeneca vaccine has “has highly favorable stability and storage characteristics, can be produced by multiple global manufacturers to supply billions of doses, and is well positioned for global vaccine distribution.”
The second vaccine, NVX-CoV2373, developed by Novovax, a biotech company based in Gaithersburg, Md., had an efficacy of 49.4% against symptomatic COVID-19 caused by the South African variant – a result that Neuzil characterized as “modest.” But Novovax reported that all five cases of severe disease occurred in the South Africa trial occurred in the placebo group, so the efficacy rate was 100%.
Neuzil also reported data from two other trials that included South African participants. The Johnson & Johnson vaccine (Ad26.COV2.S) “showed significant efficacy against moderate-to-severe disease” at 64%, “with higher efficacy against severe-to-critical disease,” at 82%. The second trial, which included only 800 South African participants, found no cases among those given the Pfizer-BioNTech vaccine (BNT162b2), compared with nine in the placebo group.
Some of these results are encouraging, but Neuzil writes that “SARS-CoV-2 will continue to replicate in humans, mutations with continue to occur, and variants of concern will continue to emerge.” New vaccines will almost certainly be needed to address difficult variants. While drug companies will become even more adept at developing them and “faster production timelines will facilitate the manufacturing of new vaccines,” distributing booster doses will still be an arduous process.
COVID Solutions Bulletin | a publication providing regular updates on new and existing technologies that can help stop the spread of COVID-19, and help clear the air to open America back up.
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In this issue:
The World Health Organization (WHO) and the U.S. Centers for Disease Control and Prevention (CDC) have both revised their guidance on how SARS-CoV-2, the COVID-19 virus, is transmitted. Earlier, the two organizations said the virus was contained in droplets, which would fall harmlessly to the ground of their own weight within a few feet. Now, WHO and CDC are acknowledging that the virus is carried in tinier aerosols, which, as the WHO put it, “remain suspended in the air,” carrying pathogens around a room.
This revision repeats what the CDC stated in November in a softer version – but then quickly retracted as what a spokesperson called an “error of process.” According to a Washington Post report at the time, the CDC originally said it was “possible” that SARS-CoV-2 could be airborne, spreading through “small particles, such as those in aerosols.”
A Long and Frustrating Road for Aerosol Experts
The issue of airborne spread has been controversial for nearly a year. For example, a July article by Lidia Morawska of the Queensland University of Technology in Australia and Donald Milton of the University of Maryland School of Public Health, titled “It’s Time to Address Airborne Transmission of Coronavirus 2019,” drew the support of 237 scientists in an open letter. The authors wrote:
There is significant potential for inhalation exposure to viruses in microscopic respiratory drop- lets (microdroplets) at short to medium distances (up to several meters, or room scale), and we are advocating for the use of preventive measures to mitigate this route of airborne transmission.
Then in November, Kimberly Prather of the Scripps Institute of Oceanography, an expert on aerosols, and several colleagues wrote a letter to Science magazine, with an excellent description of how the virus is spread:
Viruses in droplets (larger than 100 µm) typically fall to the ground in seconds within 2 m of the source and can be sprayed like tiny cannonballs onto nearby individuals. Because of their limited travel range, physical distancing reduces exposure to these droplets. Viruses in aerosols (smaller than 100 µm) can remain suspended in the air for many seconds to hours, like smoke, and be inhaled….
Individuals with COVID-19, many of whom have no symptoms, release thousands of virus-laden aerosols and far fewer droplets when breathing and talking. Thus, one is far more likely to inhale aerosols than be sprayed by a droplet, and so the balance of attention must be shifted to protecting against airborne transmission.
As we reported in the first issue of this newsletter, a group of 13 U.S. public health experts, including such members of President Biden’s own COVID task force as Rick Bright, the former director of the Biomedical Advanced Research and Development Authority, and Michael Osterholm, a highly regarded epidemiologist at the University of Minnesota, called for “immediate action to strengthen measures to limit inhalation exposure to SARS-CoV-2.
The 13 scientists wrote in a letter Feb. 16 to Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC); Administration COVID Coordinator Jeff Zients; and Anthony Fauci, director of NIH’s National Institute of Allergy and Infectious Diseases:
For many months it has been clear that transmission through inhalation of small aerosol particles is an important and significant mode of SARS-CoV-2 virus transmission… Numerous studies have demonstrated that aerosols produced through breathing, talking, and singing are concentrated close to the infected person, can remain in air and viable for long periods of time and travel long distances within a room and sometimes farther.
Linsey Marr, an expert on aerosols at Virginia Tech who also signed the Science letter, was quoted as saying:
It’s time to stop pussyfooting around the fact that the virus is transmitted mostly through the air. If we properly acknowledge this, and get the right recommendations and guidance into place, this is our chance to end the pandemic in the next six months. If we don’t do this, it could very well drag on.
A Momentous Shift
In a long opinion piece on May 7 the New York Times, with the headline, “Why Did It Take So Long to Accept the Facts About COVID,” Zeynep Tufekci expressed the view that the updates by WHO and CDC were momentous. “A few sentences have shaken a century of science,” she wrote. “These latest shifts challenge key infection control assumptions,…putting a lot of what went wrong last year in context. They may also signal one of the most important advancements in public health during this pandemic.”
But she also pointed out that the two organizations gave the changes short shrift: “no news conference, no big announcement.” Perhaps they were embarrassed.
If the importance of aerosol transmission had been accepted early, we would have been told from the beginning that it was much safer outdoors, where these small particles disperse more easily, as long as you avoid close, prolonged contact with others. We would have tried to make sure indoor spaces were well ventilated, with air filtered as necessary.
Instead of blanket rules on gatherings, we would have targeted conditions that can produce superspreading events: people in poorly ventilated indoor spaces, especially if engaged over time in activities that increase aerosol production, like shouting and singing. We would have started using masks more quickly, and we would have paid more attention to their fit, too. And we would have been less obsessed with cleaning surfaces. Our mitigations would have been much more effective, sparing us a great deal of suffering and anxiety.
Super-Spreader Events 32.6x More Likely Indoors Than Outdoors
It is now crystal-clear that the COVID problem is indoors, and the way to mitigate SARS-CoV-2 spread is through smart measures to make the air inside not just clean but safe. In addition, what we are learning about COVID applies as well to other viruses, bacteria, and mold.
The data are now overwhelming. A systematic review by Tomasso Celeste Bulfone of the the University of California at Berkeley and colleagues in the Journal of Infectious Diseases looked at studies of peer-reviewed papers that compared interior and outdoor infection. Their conclusion: “Less than 10% of reported [SARS-CoV-2] transmissions occurred in outdoor settings [and] less than 5% of cases were related to outdoor occupations…. The odds of transmission or super-spreading are much lower outdoors.”
Bulfone and the other researchers noted that, of 318 identified outbreaks involving three or more cases in China reported to local Municipal Health Commissions in a one-month period, all occurred in indoor environments. And a Japanese study found that “the odds of a primary case transmitting COVID-19 in a closed environment were 18.7 times greater…compared to outdoor setting. The odds of a single case spreading to 3 or more individuals, which they defined as a super-spreader event, in closed environments compared to open air was 32.6 [to 1].” Another study of 10,926 cases found that less than one percent of transmissions occurred outdoors.
An April 13 opinion piece in the Denver Post headlined, “The CDC finally admits it was wrong about surface transmission of COVID-19,” Alex Huffman, an associate professor of chemistry at the University of Denver who studies biological aerosols, wrote:
Respiratory aerosols can be inhaled no matter where you are in a room. If you are standing within a few feet from someone infected, you breathe in a high concentration of virus and the risk is highest. Even if you are standing on the other side of the room, the virus can still infect you. At first, most public health agencies wrongly assumed that COVID-19 was spreading primarily through touch or droplets,…but increasingly deep and wide evidence has shown that inhalation of these smaller aerosols drives the majority of COVID spread.
None of this is new. It was merely ignored. Early in the pandemic, Canadian journalist Jonathan Kay analyzed 58 separate COVID-19 "super spreader" events in 28 countries. Kay's study was published in the blog Quillette on April 20, 2020. Kay is admits that he is not an epidemiologist and that his data are “substandard,” but they were also enormously powerful and impossible to overlook.
He found that 19 of the events “involved parties or liquor-fueled mass attendance festivals of one kind or another, including…celebrations of weddings, engagements and birthdays. Fourteen super-spreader events occurred at religious services or funerals and six involved “face-to-face business networking.” None concerned casual or incidental contact. Except for three incidents at sports events, where people were packed tight and spreading virus by cheering, all the events were outdoors. “It is notable, for instance,” Kay writes, “that the notorious outbreak at an Austrian ski resort is connected to a bartender and not, say, a lift operator.” Kay concludes his article with these prescient words:
If the principal modes of COVID-19 transmission can be narrowed down in this way, it would provide an enormous boon to the policymakers who are now starting to think about restarting our economies. Fighting this disease will always be hard. But it will be harder still if we fail to develop a proper understanding of the precise way it attacks us.
At last, it seems, the world is recognizing the nature of the beast.
Ventilation Is 'Unlikely to Succeed as the Prime Means of Protection'
The question is how best to prevent airborne SARS-CoV-2 from continuing to infect people, especially as they go back to school and work.
According to an extensive article in HPAC Engineering, the definitive answer is not ventilation – that is, the exchange of indoor for outdoor air through a heating and cooling, or HVAC, system.
Gary and Ken Elovitz of Energy Economics in Newton Centre, Mass., write:
The biggest danger for COVID-19 infection is close-range contact with infected people who are talking loudly or are otherwise exhaling heavily for at least several minutes. The HVAC system does not have much effect on those conditions.
The Elovitzes’ main contribution is to deploy the Wells-Riley equation, which uses “infectious particle concentration, exposure time, and outside air ventilation” to come up with a prediction of the “likelihood that a person will be infected by a virus.” (Academic research shows that, if anything, Wells-Riley underestimates risk.)
After the authors plug in the numbers, they conclude:
No practical amount of ventilation can be relied on or expected to protect occupants over long exposure times like the 6 or 8 hours people might spend together in an office or school classroom. Similarly, ventilation is unlikely to succeed as the prime means of protection for people in close contact in a small space like a private office. However, short term, intermittent contact in large spaces like a trip to the supermarket is unlikely to spread infection.
The authors say that “improved filtration can reduce the risk of transmission by reducing the concentration of infectious particles in the air.” But that reduction is by no means complete. They write that, on average, “MERV 13 filters might be 60% to 70% efficient at removing particles that contain viral material.” The authors also warn that higher-efficiency filters “have higher pressure drop,” which means reduced air flow and heating and cooling capacity. Bringing an HVAC system back up to its pre-filter levels of air flow requires an increased “motor load” – that is, a bigger-capacity system, which will use more energy and pose a greater threat to the environment.
Current Standards, Writes Allen of Harvard, Are Set for Bare Minimums
In fact, as an April 16 JAMA article by Joseph Allen of the Harvard T.H. Chan School of Public Health and Andrew Ibrahim of the University of Michigan points out, “an important flaw exists in how most buildings operate in that the current standards for ventilation and filtration in indoor spaces, except for hospitals are set for bare minimums and not designed for infection control.”
This is an indictment of the ventilation industry, which for decades has put people in jeopardy indoors. But the immediate point that Allen and Ibrahim are making is that HVAC systems generally do not produce enough air changes per hour for good health. In other words, these systems already require more power without loading them down with filtration systems.
But to get back to the Elovitzes…. They are also skeptical of ultraviolet disinfection systems because “ultraviolet radiation can harm people.” As for bipolar ionization systems, some of them “produce ozone as a byproduct,” and “there are no industry standards or test protocols” for these systems, “so performance is not verified.”
They conclude, “There is no solid evidence that HVAC systems can be a primary means of control” of COVID-19 spread.
COVID-19 Mitigation Can Damage the Environment
As Allen and Ibrahim write, “Increasing air exchange rates involves trade-offs including the added costs of moving more air as well as heating or cooling this volume of air.
Writing last year in the Wall Street Journal, Konrad Putzier amplified this point: “Some building owners find that they face a choice between lowering their energy use and keeping tenants safer from infection.” The truth is, devices do exist that destroy the virus with little or no effect on energy use – and those devices can be used with good effect as complements to ventilation. But simply increasing ventilation or adding filters to HVAC systems can both dramatically increase expenses and threaten the global climate.
The Journal article noted that in a study last year, “real-estate technology company Enertiv found that HVAC costs in office buildings increased 36% during the pandemic.” And buildings and construction account for 39% of all energy-related carbon emissions.
Ventilation is sometimes cited as a way to chase away pathogens or capture them if a filter is added. But the minimum standards (for example, five to six air changes per hour for schools) set by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) are rarely met, as Allen and Ibrahim note. And some researchers believe the rates are too low to be effective.
Doubling the amount of outdoor air “reduces the chance of infection by up to 35% in densely packed venues such as restaurants,” writes Dyani Lewis in the journal Nature, referring to a preprint of a study by Liangzhu Wang and colleagues at Concordia University. But even wearing a mask indoors is “more effective than changing the air.”
Another scientist quoted in the Nature article points out that “the environmental cost of increased ventilation should give people pause.” Large HVAC companies have a stake in encouraging school administrators and building owners to increase the size and power of their systems – and thus, energy consumption -- to produce more air changes per hour.
It’s important to note that “air change” does not mean a 100% exchange of interior air with clean outdoor air. Instead, as the CDC calculates, it will still take 104 minutes in a room with four air changes per hour to eliminate at least 99.9% of contaminants – unless, of course, an infected person enters the room during those 104 minutes.
ASHRAE urged property managers in April to consider keeping HVAC systems running for 24 hours a day and bringing in more outside air. Because outside air typically has to be heated in the winter or cooled in the summer, it uses up more energy than merely recirculating indoor air. HVAC systems certainly have their place in the battle against COVID when combined with devices that inactivate the virus in the air, but running an HVAC system 24/7 seems deeply irresponsible environmentally.
Worse Than We Thought
COVID may be even worse than we thought. A Research Letter in JAMA on April 2 calculates that between March 2020, and Jan. 2, 2021, the U.S. experienced 22.9% more deaths than were expected before the pandemic. The study, by Seven H. Woolf of the Virginia Commonwealth University Medical School and colleagues, looked not just at COVID-19 deaths but at all-cause mortality. In fact, COVID represented only 72.4% of U.S. excess deaths for the nine-month period.
What were the other major causes? Heart disease, Alzheimer’s disease and other dementia, and diabetes. The authors found that these excess deaths showed surges that corresponded to COVID surges, pointing to COVID as the reason the other diseases took more lives than expected.
The researchers speculate that these deaths could actually have been caused by COVID but the infection was undocumented so mortality was attributed to another disease. Another possibility – which the authors cited in an earlier JAMA piece – is that the pandemic caused illnesses such as heart disease and diabetes to go untreated or undetected. In addition, fear of COVID-19 may have caused patients to neglect their care, unable or unwilling to visit physicians’ offices or go to emergency rooms.
The authors identify Mississippi, New Jersey, New York, Arizona, Alabama, Louisiana, South Dakota, North Dakota, New Mexico and Ohio as the states with the higher per capita rate of excess death. “New York,” they write, “experienced the largest relative increase in all-cause mortality” at 38.1%, a daunting figure.
Will We Ever Get Heard Immunity?
As nearly everyone knows, the CDC on April 27 issued new guidance for the 33% of Americans who are fully vaccinated against COVID-19. The big change is that if you’re vaccinated, you can “participate in outdoor activities and recreation without a mask, except in certain crowded settings and venues.” But right around the same time, vaccinations started to slow. As of May 3, the number of shots per day had dropped 50% when compared to just three weeks earlier.
More than 70% of Americans over 65 are vaccinated, and clearly the shots are having an effect. Overall, cases of COVID have dropped from a late January seven-day average of 260,000 to 45,000 last week, and deaths have declined from a seven-day average of 3,263 to 693.
It appears, nevertheless, that COVID-19 is not going to disappear because of herd immunity – that is, resistance to the spread of the disease because a high proportion of the population has had a previous infection or vaccination. A sobering report by Apoorva Mandavilli on May 5 surveyed experts, who now believe that the herd immunity threshold is not attainable — at least not in the foreseeable future, and perhaps not ever.”
Instead, Mandavilli writes:
The virus will most likely become a manageable threat that will continue to circulate in the United States for years to come, still causing hospitalizations and deaths but in much smaller numbers. How much smaller is uncertain and depends in part on how much of the nation, and the world, becomes vaccinated and how the coronavirus evolves.
The problem is that the virus is changing quickly into variants that spread too easily, and, at the same time, “vaccination is proceeding too slowly.” The main variant spreading in the U.S., called B.1.1.7 and first identified in Britain, is about 60% more transmissible than the virus that was first identified.
As Mandavilli writes in the New York Times:
Polls show that about 30 percent of the U.S. population is still reluctant to be vaccinated. That number is expected to improve but probably not enough. “It is theoretically possible that we could get to about 90 percent vaccination coverage, but not super likely, I would say,” said Marc Lipsitch, an epidemiologist at the Harvard T.H. Chan School of Public Health.
Variants are developing globally because only 8% of people worldwide have received a single dose, and those mutated viruses will inevitably move to the United States. An Axios headline on May 7 referred to “The race to avoid a possible ‘monster’ COVID variant.”
Reporter Eileen Drage O’Reilly quoted Josh Schiffer, an infectious disease expert at Fred Hutchinson Cancer Research Center, as saying, “If there is a new variant that's terrible — that ruins 2022 and brings us back to very dark times — it's almost a guarantee that it's percolating in an area of the world that's getting hit very hard now," Schiffer says.
All the more reason to get interior pathogen mitigation right.
Welcome to the fourth issue of COVID Solutions Bulletin. Because of your expertise, you have been chosen part of a select audience to receive this e-mailed publication. Our mission is to educate influential Americans on innovative solutions to the COVID-19 crisis in America. We need to get back to work, to school, to play – to enjoying life. We can’t get there without thwarting the current pandemic and preparing for the likelihood of other pathogens to come.
One of our themes is this: Masks, distancing, testing, even vaccines are not enough. Environmental solutions have to be part of the effort – and that means technologies that neutralize pathogens, including the COVID virus, where they have the best chance to spread and infect – in interior settings. We hope you find this newsletter enlightening and will share your feedback.
In this issue:
Beyond COVID-19: The Need for Safe Air, Always
On April 7, the seven-day moving average of COVID deaths in the U.S. dropped to 642, the lowest figure in nine months. More recently, deaths and cases ticked up but then leveled off, and it appears that as vaccinations increase, the COVID threat is being contained. Some 88 million Americans, or one-quarter of the total population, have been fully vaccinated, as have two-thirds of those 65 and over.
But even when the pandemic disappears, the danger of pathogens – viruses, bacteria and molds – will remain. In fact, many of those pathogens are harder to neutralize than SARS-CoV-2, whose envelope is particularly vulnerable. (The Spaulding disinfection hierarchy places enveloped viruses at the bottom of its pyramid as easiest to inactivate, with spores and mycobacteria at the top.) The lesson Americans should take away from the COVID experience the lesson that air does not need to be merely clean but safe.
Influenza at a Record Low, a Condemnation of Traditional Ventilation
Consider influenza. The official flu season is over at the end of April. For 2020-21, the total hospitalization rate has been 0.7 per 100,000 Americans – or just 215 people, the lowest number since reliable data started being collected in 2005. According to the CDC, that is about one-eighth the rate during the last low-severity flu season, in 2011-12.
Only one – yes, just one – pediatric death has been reported in the 2020-21 flu season, compared with an average of 180 deaths of children in the preceding three flu seasons. In a single week during the 2019-20 flu season, 19 American children died.
What’s happening here? First, fewer people are mingling with other people in groups like classrooms or basketball arenas. Second, steps taken to mitigate COVID-19 also affect influenza. “Hand washing, social distancing, and wearing masks are certainly driving down cases of the flu,” said Dr. Casey Kelley, a family medicine physician and the founder and medical director of Case Integrative Health in Chicago, as quoted in a Healthline article.
But the results are also a condemnation of the poor state of indoor air over many years in our schools, factories and other gathering places, including homes. Because we weren’t there or because we were masked, we didn’t get infected by the flu virus, but if HVAC ventilation had been accompanied or supplanted by other technologies, we would have been saving lives for decades. And it’s not only the flu. Indoor air is needlessly contaminated by bacteria, mold, and other viruses.
Perhaps the most important lesson of the pandemic is that we have to make interior air safe – not just for COVID but for what’s already here and what may come.
Indoor Spaces are 'Prime COVID Hotspots'
Occasionally, a single article will perfectly capture a complex situation at precisely the right time. That is the case with the piece that appeared March 30 in the 152-year-old scientific journal Nature, carrying the headline, “Why indoor spaces are still prime COVID hotspots: Risks shoot up when virus particles accumulate in buildings, but it’s not clear how best to improve ventilation.”
Very late in the game, scientists and policy makers have come to the conclusion that the real danger in this pandemic is airborne transmission of the SARS-CoV-2 virus in interior spaces, writes Dyani Lewis, a journalist based in Melbourne, Australia. Now, the big question is what to do about it. Again, there’s growing realization that initial approaches – opening windows, ramping up ventilation, adding filters to HVAC systems – have been inadequate. The Nature article tells the story….
As late as March 28 of last year, the World Health Organization (WHO) was broadcasting this message on Twitter and Facebook: “FACT: 3COVID19 is NOT airborne.” It took another three months to produce even the soft admonition that airborne transmission in “crowded and inadequately ventilated spaces over a long period of time with infected persons cannot be ruled out.”
We now know better, and, in the Nature article, Lewis quotes Yuguo Li, a building environment engineer at the University of Hong Kong as saying, “We would have saved a lot of people” if WHO and others had recognized airborne transmission earlier.
WHO is still not going far enough. “Airborne transmission is dominant,” says Joseph Allen at Harvard’s T.H. Chan School of Public Health. Jose-Luis Jimenez, an atmospheric chemist at the University of Colorado, is quoted by Lewis as saying, “They don’t emphasize how important it is.” What the WHO needs to say is, “FACT: it goes through the air.”
In July, 239 scientists signed a letter that began:
We appeal to the medical community and to the relevant national and international bodies to recognize the potential for airborne spread of coronavirus disease 2019 (COVID-19). There is significant potential for inhalation exposure to viruses in microscopic respiratory droplets (microdroplets) at short to medium distances (up to several meters, or room scale), and we are advocating for the use of preventive measures to mitigate this route of airborne transmission.
Then in October, the Lancet, another venerable British scientific publication, reported that “growing evidence has highlighted that infective microdroplets are small enough to remain suspended in the air and expose individuals at distances beyond 2 m from an infected person. This knowledge is also corroborated by investigation of spread of cases between people who were not in direct or indirect contact, suggesting that airborne transmission was the most likely route.” Bigger droplets fall to the ground, where they are harmless, but tiny ones hang around.
Still, mitigation of interior spread has been sluggish, and governments slow to respond. As we noted in Issue No. 1 of this newsletter, in a remarkable letter on Feb. 16, a group of 13 U.S. health experts, including such members of President Biden’s own COVID task force as Rick Bright, the former director of the Biomedical Advanced Research and Development Authority, and Michael Osterholm, a highly regarded epidemiologist at the University of Minnesota, called for immediate action to “limit airborne transmission of the virus in high-risk settings like meatpacking plants and prisons.”
Still, these warnings are not being taken seriously enough. Jimenez, quoted in the Nature piece, points out that governments and businesses are spending vast sums on surface disinfection even though contaminated surfaces are rarely the source of transmission. “By contrast,” writes Lewis, “few countries have invested in measures to improve indoor air quality.”
How to Improve Air Quality
Then there’s the question of how to stop indoor spread. Lewis’s article makes clear that simple ventilation – which exchanges indoor for outdoor air – is not enough. Christian Kahler, a physicist who studies aerosols at the University of the Federal Armed Forces in Munich, says that few HVAC systems are powerful enough to use 100% outside air: “Most office spaces and classrooms around the world are supplied with just 20% outside air, with the remainder recirculated.”
A big problem is that increasing the exchange of air consumes a lot of energy – as does the addition of filters on HVAC systems. Lewis quotes Li as saying, “The environmental cost of increased ventilation should give people pause.” Cranking up ventilation also makes rooms drafty and noisy.
One answer, says Kahler, is “mobile air purifiers that filter out viruses and other airborne contaminants.” These units “could be readily deployed as part of the solution…and would be more energy-efficient than using extra heating or cooling on outside air,” Lewis writes. One scientist noted that air purifiers, “in some scenarios, outperformed the ventilation for removing aerosols.”
In fact, some mobile units not merely remove viral aerosols through filters – a slow and often ineffective process – they actually neutralize pathogens. In the technology used by the firm ActivePure, for example, submicroscopic particles are unleashed that quickly latch onto pathogens like SARS-CoV-2 and inactivate them.
Long-Term Troubles Even for Patients With Mild COVID-19
We know that 80% of patients hospitalized with COVID-19 exhibit persistent symptoms long after coming down with the disease. Now, a research letter published by JAMA on April 7 reports the results of a study of long-term symptoms in a group with mild COIVD symptoms. The results are troublesome: “A considerable portion of low-risk individuals with mild COVID-19 reported a diversity of long-term symptoms, and these symptoms disrupted work, social, and home life.”
Sebastian Haverall of the Karolinska Institute in Stockholm and two other Swedish researchers examined 323 seropositive (that is, tested positive for the SARS-CoV-2 virus) health care professionals with zero or mild previous COVID symptoms and 1,074 seronegative participants as a control. Some 26% of the seropositive subjects reported at least one moderate to severe symptom lasting for at least two months, compared with just 9% of the seronegative subjects. And 8% of the seropositive participants had a symptom lasting at least eight months, compared with 4% of the seronegative participants.
“Of the seropositive participants, 15% reported their long-term symptoms moderately to markedly disrupted their work life, compared with 6% of the control group. The most common symptoms were fatigue, shortness of breath, and loss of the senses of smell and taste. Those in the study were relatively young: a median age of 43.
From Sea Spray to COVID Aerosols
A recent article in EOS, a publication of the American Geophysical Union, highlighted the work of Kimberly Prather, a professor at the Scripps Institution of Oceanography in San Diego. “Prather usually spends her days looking at pollution in the ocean and its effects on human health,” writes Jenessa Duncombe. “But since the outbreak of the coronavirus, Prather has dedicated herself to understanding the airborne spread of the virus.”
Prather and 11 scientific colleagues have put together an exhaustive FAQ on “Protecting Yourself from COVID-19 Aerosol Transmission.” The 62-page document covers subjects like outdoor vs. indoor, spread by singing and musical instruments, and the effectiveness of ventilation, filters, portable air cleaners, and ultraviolet light. “I’ve gotten a ridiculous number of thank-you letters from all over the world saying how many lives I’ve saved,” Prather is quoted as saying. “That’s nice, but I want this thing to end.”
Prather was one of the 13 scientists who sent the Feb. 16 letter to CDC Director Rochelle Walensky, NIH’s Tony Fauci, and Jeffrey Zients, the White House Coronavirus Response Coordinator.
“We were all baffled that [public health agencies] didn’t take aerosol transmission as being more serious to begin with,” said Jorgen Jensen of the National Center for Atmospheric Research, quoted in the EOS article. “There were people who were hammering that, and they were not being heard for many, many months, and my feeling is that was a tragedy.”
Two Leading Infectious Disease Scientists Join Firms Fighting COVID
Further evidence of the importance of fighting SARS-CoV-2 indoors came last week with the announcement that Robert Redfield, the former director of the CDC, would be advising a Kentucky-based company called Big Ass Fans, known for its large ceiling fans. Big Ass sells a “smart fan” for $1,750 that uses UV light against pathogens.
In March, ActivePure Technology of Dallas, whose Medical Guardian device has been cleared by the FDA, announced that Deborah Birx, former director of the coronavirus response under President Trump and for seven years Global AIDS Coordinator at the State Department, had joined the company as Chief Medical and Scientific Advisor. Dr. Birx was in charge of PEPFAR, the largest single program by any nation in history to battle a single disease globally. PEPFAR has save more than 18 million lives.
In December, the University of Texas Medical Branch confirmed that the technology inside the ActivePure’s devices neutralizes over 99.9% of airborne SARS-CoV-2 within three minutes.
Both Dr. Redfield and Dr. Birx are physicians and former Army officers whose clinical research at the Walter Reed Army Medical Center, NIH, and elsewhere focused on the most virulent infectious disease of the time, HIV/AIDS. Now, they are turning their attention to novel solutions to COVID-19, which has already claimed 2,966,000 deaths worldwide.
Welcome to the third issue of COVID Solutions Bulletin. Because of your expertise, you have been chosen part of a select audience to receive this e-mailed publication. Our mission is to educate influential Americans on innovative solutions to the COVID-19 crisis in America. We need to get back to work, to school, to play – to enjoying life. We can’t get there without thwarting the current pandemic and preparing for the possibility of other pathogens to come.
One of our themes is this: Masks, distancing, testing, even vaccines are not enough. Environmental solutions have to be part of the effort – and that means technologies that destroy the COVID virus where it has the best chance to spread and infect – in interior settings. We hope you find this newsletter enlightening and will share your feedback.
In this issue:
COVID 3rd-Leading Cause of Death in 2020, But Data Understate Impact
On Wednesday, the Centers for Disease Control and Prevention (CDC) estimated that the age-adjusted death rate for the United States rose 15.9% last year because of COVID-19, from 715.2 per 100,000 Americans to 828.7. According to our calculations, that is the sharpest calendar-year increase in recorded U.S. history, even greater than during Spanish Influenza epidemic year of 1918, when the rise was 14.1%.
A total of 378,000 COVID deaths were recorded in 2020, ranking the disease third for the year after heart disease and cancer.
The figures, recorded over a calendar year, actually underestimate the impact of COVID. In the first three months of 2020, only about 4,000 COVID deaths occurred; for the first three months of 2021, the total is about 145,000. So for the 12 months from April 1, 2020, to March 31, 2021, the death total from COVID is approximately 520,000. That compares with about 700,000 for heart disease and 600,000 for cancer.
New Biden Jobs Plan Includes Improvements to Clear Air of
COVID Virus and Other Pathogens
Also on Wednesday, the White House issued a statement on the details of the President’s proposed American Jobs Plan. It makes the point that “we can’t close the opportunity gap if low-income kids go to schools in building that undermine health and safety.”
So President Biden is calling for “$100 billion to upgrade and build new public schools” – with $50 billion in direct grants and $50 billion through bonds. “These funds,” says the White House statement, “will first go toward making sure our schools are safe and healthy places of learning for our kids and work for teachers and other education professionals, for example by improving indoor air quality and ventilation.”
The plan is clear recognition that clean air is essential in keeping students and teachers healthy, reducing absenteeism and keeping minds focused. The term “ventilation” appears to stand for diverse methods of improving the air. Ventilation itself – the exchange of indoor for outdoor air – is desirable but, of course, does not destroy the pathogens that cause COVID-19 and other illnesses, as we note later in this newsletter.
The American Jobs Plan also calls for modernizing other buildings, including Veterans Administration hospitals, and it allots $400 billion for “care infrastructure,” expanding access to home or community are for people with aging relatives and those with disabilities. These infrastructure improvements as well are ripe for the kind of improvements that will reduce or eliminate the interior flow of pathogens like the virus that causes COVID-19.
Real-Life Results Show Vaccines Are Working
By the end of March, 29% of Americans had received at least one COVID-19 shot and 16% had received two. Half the population over age 65 is fully vaccinated. We now have early data showing the vaccinations are exceptionally effective and that adverse effects are minimal.
On March 29, the CDC’s Mortality and Morbidity Weekly Report published a study by Mark Thompson, Jefferey Burgess, et al., that looked at nearly 4,000 subjects, mainly health care workers and first responders and found that those who received both vaccinations were 90% less likely to become infected with COVID-19 than the general population; a single vaccination was 80% effective. For vaccinated subjects observed two weeks or more after their second shot, only three came down with COVID, an incidence rate of 0.04 per 1,000 person-days; for unvaccinated subjects, the rate was more than 30 times higher – 1.38 per 1,000 person-days.
These findings dovetail with the results cited in a letter by eight California physicians, published by the New England Journal of Medicine (NEJM) on March 23. The researchers found that only seven of 4,167 persons tested 15 or more days after their second vaccination became infected with COVID-19. Out of 7,958 persons who had received just one shot, 57 contracted COVID 15 or more days later.
The physicians concluded, “The rarity of positive test results 14 days after administration of the second dose of vaccine is encouraging and suggests that the efficacy of these vaccines is maintained outside the trial setting.”
Another study, reported in a letter from William Daniel and colleagues in the same issue of the NEJM, found that only four out of 8,121 fully vaccinated employees at the University of Texas Southwestern Medical Center in Dallas became infected seven days or more after the second shot. That is just 0.05% of the cohort. By comparison, 2.61% of 6,144 unvaccinated employees became infected, as did 1.82% of those who received only one shot.
Adverse Events from Vaccines Rare, But Hesitance Still High
As for adverse events, the CDC on March 22 reported that anaphylaxis – a type of severe allergic reaction – after getting a COVID-10 was “rare and occurred in approximately 2 to 5 per million vaccinated” in the United States. The reaction almost always happens within 30 minutes after getting a shot. The data come from the robust Vaccine Adverse Event Reporting System (VAERS), a project of the U.S. Department of Health and Human Services.
At the time of the CDC report, 126 million doses had been administered, and VAERS had been informed of 2,216 deaths among people who had received a shot. But don’t be alarmed. That’s about one of every 60,000 of people vaccinated, and in the U.S. roughly one in every 1,200 people die every month from all causes.
Says the Centers for Disease Control and Prevention: “CDC and FDA physicians review each case report of death as soon as notified and CDC requests medical records to further assess reports. A review of available clinical information including death certificates, autopsy, and medical records revealed no evidence that vaccination contributed to patient deaths.”
The vaccines are working. The bigger problem is getting enough people to be vaccinated. Now that supply in the U.S. is increasing briskly – 1% of Americans are getting shots each day – we are coming face to face with vaccination hesitancy, that is, fears unjustified by the data.
The Kaiser Family Foundation finds that, when asked if they will get vaccinated 13% of Americans say “definitely not,” 7% say “only if required,” and 17% want to “wait and see.” Among the definitely-nots, the rate is 15% for whites and 10% for blacks; 29% for Republicans and 5% for Democrats; 20% for people in rural areas and 10% for urban.
Air Purifiers Practical Solutions for Classrooms, Says German Study
A peer-reviewed study in the journal Aerosol Science and Technology, published March 1, concludes that “the operation of mobile air purifiers in classrooms seems feasible as a practical measure that can be quickly implemented during an epidemic.” Joachim Curtius, professor of experimental research at the Institute for Atmospheric and Environmental Sciences at the Goethe University in Frankfurt, Germany, and two of his colleagues also wrote:
In order to reduce the risks of aerosol transmission for SARS-CoV-2 [the cause of COVID-19], air purifiers can form an important additional measure of precaution, especially in cases where no fixed ventilation systems are installed and when windows cannot be opened properly.
The study found that “staying for 2 h[ours] in a closed room with a highly infective person, we estimate that the inhaled dose is reduced by a factor of six when using air purifiers.” Also, “in times when classes were conducted with windows and door closed, the aerosol concentration was reduced by more than 90% within less than 30 min when running the purifiers.”
The researchers write that “air purifiers can reduce the aerosol load in a classroom in a fast, efficient and homogeneous way” and that the costs of implementation and maintenance “need to be compared to the substantial advantages of reducing the amount of infections and COVID-19 cases.”
We learned about the Curtius study from an approving Tweet by Joseph Allen, assistant professor of exposure assessment science at the Department of Environmental Health at the Harvard T.H. Chan School of Public Health. Dr. Allen wrote that he and Richard Corsi, the Joe J. King Chair Emeritus of Engineering at the University of Texas at Austin, “did a little back of the envelope” calculation and found that it would cost “only $1B to get one of these in every classroom.” Another calculation he did came to $10 per student per year.
A Plain Cough Is More Dangerous Than Intubating a COVID Patient
A year ago, a young anesthesiologist named Cory Deburghgraeve, who worked at the state hospital of the University of Illinois in Chicago, described to a Washington Post reporter what it was like to intubate patients in the ICU with COVID-19:
My mask and hood can get covered in fluid. Usually it’s tiny droplets. Aerosolized virus can float around. You’re basically right next to the nuclear reactor. I go in confident and fast, because if you miss on the first try, you have to do it again, and then you’re bringing out a ton more virus.
But in October, a paper in the journal Anaesthesia by J. Brown of the North Bristol (U.K.) National Health Service Trust and colleagues found that a simple cough produces about 20 more particles than the procedure of intubating a patient. The number of particles detected per cough was actually higher with ventilation on than with ventilation off. Or, as the headline on a CNN.com article on March 12 put it, “Cough more hazardous to Covid-19 medical workers than intubation, research suggests.”
The same particles of SARS-CoV-2, the virus that causes COVID-19, that harmed the medical workers in the Brown study are emitted not just in health care and nursing home settings but in interiors anywhere, including offices, schools, stores, restaurants, and gyms. And in some of settings, masks come off when people are eating, drinking or exercising.
As the CNN article stated: “Other new studies show that patients with COVID simply talking or breathing, even in a well-ventilated room, could make workers sick in [a] CDC-sanctioned mask.” The piece also cited “the growing body of studies showing aerosol spread of COVID-19 during choir practice, on a bus, in a restaurant and at gyms.”
Another study, conducted by Harvard and Tulane researchers, published in the Proceedings of the National Academy of Sciences on Feb. 23, found that super-spreaders infected with COVID, mainly older or obese people, emit three times more aerosol particles than younger, healthier people. “The upshot is that it’s inhalation” of tiny airborne particles that leads to infection, says Donald Milton of the University of Maryland School of Public Health.
If schools are to reopen safely and Americans are to get back to something close to normal, a different approach is clearly needed to defeat COVID indoors. Ventilation, which simply exchanges old air for new but doesn’t destroy the virus itself, is obviously insufficient. Virus particles have to arrive at filters, a slow and inefficient process. Ultraviolet light is dangerous to humans and animals, and wearing an N95 mask at all times is, for nearly everyone, is an impossibility.
In solving the problem of airborne spread of SARS-CoV-2 indoors, scientists and policy experts are looking increasingly at technologies that blast out sub-microscopic particles that neutralize SARS-CoV-2 and other pathogens immediately in the air as well as on surfaces. Such technologies also have the advantage of quick installation. They don’t require expensive changes to HVAC systems – or the installation of brand-new systems in schools and older buildings that lack them.
Dr. Birx Joins Maker of Devices That Destroy Interior Pathogens
In the latest indication of the importance of battling the COVID-19 virus in interior spaces, Deborah Birx – the high-profile scientific researcher, physician, and former public official – on March 15 joined a leading U.S. manufacturer of scientifically advanced infection-prevention devices.
MarketWatch described Dr. Birx as “a world-renowned global health official and a retired U.S. Army physician who was instrumental in HIV/AIDS vaccine research, and whose career has spanned three decades.” She was appointed by President Obama in 2014 to head the fight against the global HIV/AIDS epidemic and then last year by President Trump as response coordinator for the COVID-19 epidemic in this country.
Birx, who left government last month, became Chief Medical and Scientific Advisor to ActivePure Technologies, a Dallas-based company that makes a variety of devices that quickly and safely destroy viruses, bacteria and other pathogens in the air and on surfaces. The story of Birx’s move was first reported by Reuters on March 12.
Also on March 12, the George W. Bush Institute announced that Dr. Birx would join the organization as a Senior Fellow. “In the role,” said a press release from the George W. Bush Presidential Center in Dallas, “she will leverage her significant expertise in global health, pandemic response, and health systems to support the Bush Institute’s portfolio of work. She will also take on policy initiatives on how to better position our country to tackle health disparities in the future based off the lessons learned from the COVID-19 pandemic.”
ABC News reported that Birx said ActivePure “could help people get back indoors in a way that is safe.” ABC added that Birx….
…said ActivePure, which develops air purification technology for indoor spaces, could help people get back indoors in a way that is safe. "While I was out across the country listening to communities, the number one thing that everyone asked me was when will we get back to normal," Birx said.
ActivePure sells products used against other pathogens in the air and is in the process of applying for Food and Drug Administration approval of its technology to fight the novel coronavirus, as well. "It's about COVID-19 now, but I think it's going to be about aerosolized and respiratory viruses in the future," Birx said. "I think we'll all look at our indoor space in a much more critical way."
In 2014, President Obama appointed Birx as Global AIDS Coordinator at the State Department, heading the President’s Emergency Plan for AIDS Relief, or PEPFAR, the largest global health effort by a single nation in history.
PEPFAR was launched by President George W. Bush in 2003 with overwhelming bipartisan congressional support. To date, the program has invested more than $90 billion fighting the AIDS epidemic and has saved more than 18 million lives, mainly in Africa. Birx was the longest-serving AIDS Coordinator when she was asked a year ago by President Trump to take on the additional job of coordinating the response to the COVID-19 pandemic.
Serving in the U.S. Army, she achieved the rank of colonel and headed research efforts on contagious diseases at Walter Reed National Military Medical Center and at the Centers for Disease Control before going to the State Department. She has been author or co-author on more than 200 papers published in peer-reviewed journals.
CDC Says ‘Risk of Spreading’ COVID Virus by Ventilation Systems Still Unclear
The Centers for Disease Control (CDC) has been somewhat ambivalent about the value of ventilation systems, as opposed to systems that actively destroy pathogens in the air. It’s worth quoting CDC guidance updated March 23:
The risk of spreading SARS-CoV-2, the virus that causes COVID-19, through ventilation systems is not clear at this time. Viral RNA has reportedly been found on return air grilles, in return air ducts, and on heating, ventilation, and air conditioning (HVAC) filters, but detecting viral RNA alone does not imply that the virus was capable of transmitting disease.
One research group reported that the use of a new air-sampling method allowed them to find viable viral particles within a COVID-19 patient’s hospital room with good ventilation, filtration and ultraviolet (UV) disinfection (at distances as far as 16 feet from the patient). However, the concentration of viable virus detected was believed to be too low to cause disease transmission. There may be some implications for HVAC systems associated with these findings, but it is too early to conclude that with certainty.
Revealing Classroom Animation
The New York Times recently posted this excellent animation with a headline about opening windows being the key to opening schools – though, as the Times itself demonstrated, it’s not as simple as that. The best answer (see Scenario 3) was a fan plus a portable air-cleaning unit.
In this issue:
CDC Issues Guidelines for Vaccinated Americans;
Some Call Them ‘Timid’
Some 9.5% of Americans have received all their COVID-19 shots (two for Moderna and Pfizer/BioNTech and one for Johnson & Johnson) as of Monday, and on that same day the Centers for Disease Control and Prevention (CDC) issued guidelines for those who have been completely vaccinated.
The gist is this: Two weeks after your final shot, you can, without a mask, get together indoors with others who have been completely vaccinated. You can also “gather indoors with unvaccinated people from one other household (for example, visiting with relatives who all live together) without masks, unless any of those people or anyone they live with has an increased risk for severe illness from COVID-19.” Plus, if you have been around someone with COVID, you don’t have to “stay away from others or get tested unless you have symptoms.”
But, says the CDC, you should “still avoid medium or large-sized gatherings,” and you should “still delay domestic and international travel” and observe the same recommendation as people who are not vaccinated: “do not travel at this time…. Stay home to protect yourself and others from COVID-19.”
In addition, says the CDC, “you should still take steps to protect yourself and others in many situations, like wearing a mask, staying at least 6 feet apart from others, and avoiding crowds and poorly ventilated spaces.” These precautions are necessary if you are in public, if you’re gathering with unvaccinated people from more than one other household, or if you are visiting an unvaccinated person at risk of severe illness from COVID or who lives with a person at increased risk.
For example, if you’re eating inside in a restaurant, you have no idea whether the other people are vaccinated. Even if you wear a mask, you have to take it off to eat – which means that you will, at the very least, be endangering others, and maybe yourself as well.
The CDC mentions ventilation as helpful, but ventilation falls far short of the effectiveness that brings peace of mind. Ventilation is a process that exchanges air several times a day, but that means that particles of SARS-CoV-2, the virus that causes COVID-19, can be hanging in the air between changes. Ventilation also causes particles to be blown from one side of the room (perhaps the side with an infected person) to another.
Another answer is technology that actively blasts out submicroscopic particles that hunt down and destroy airborne SARS-Cov-2 and other viruses, bacteria, and mold. One company that manufactures PPD technology, Dallas-based ActivePure Technologies, has received Class II medical device clearance from the Food & Drug Administration (FDA).
It’s also important to understand that none of the three vaccines that have received Emergency Use Authorization has 100% efficacy. In other words, Phase 3 trials found that some people who were vaccinated did come down with a COVID-19 infection. As the CDC warns, even if you were completely vaccinated, “you should still watch out for symptoms of COVID-19, especially if you’ve been around someone who is sick. If you have symptoms of COVID-19, you should get tested and stay home and away from others.
Some experts were unhappy that the CDC did not go farther. “While some guidance is better than no guidance,” wrote Leana S. Wen, the former health commissioner of the City of Baltimore and a columnist for the Washington Post, “the guidelines are too timid and too limited, and they fail to tie reopening guidance with vaccination status. As a result, the CDC missed a critical opportunity to incentivize Americans to be vaccinated.”
The CDC admits that scientists are “still learning how effective the vaccines are against variants of the virus that causes COVID-19. Early data show the vaccines may work against some variants but could be less effective against others.” An advantage of active seek-and-destroy systems is that, as mass-pathogen neutralizers, they are likely to be just as effective against SARS-CoV-2 variants – not to mention airborne bacteria.
After Trader Joe’s Worker Asks for Protection
Against Airborne COVID, He Is Fired, Then Reinstated
Six days following a report in Newsweek that a Trader Joe’s employee was fired after writing a letter to the grocery chain’s CEO asking for better protections against the COVID-19, the company issued an update on how it is “caring for crew members and customers” during the pandemic.
Trader Joe’s cited wellness checks, mask mandates, reduced store hours, enhanced cleaning, extra pay, plexiglass barriers, and other steps. The company’s update, however, did not appear to address the main complaint in the letter from Ben Bonnema, the worker who was fired.
Bonnema’s letter was reproduced in a Tweet that went viral. That letter referred to a Feb. 15 letter from 13 scientific experts, including three members of President Biden’s COVID-19 task force, to Jeffrey Zients, the President’s COVID coorindator; Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC); and Tony Fauci, director of the National Institute of Allergy and Infectious Diseases of the National Institutes of Health (NIH). The letter from the experts demanded that the Administration update guidance on battling the spread of COVID-19 through the air in enclosed spaces.
Outdated guidelines from the Trump Administration “have not been…strengthened to address and limit inhalation exposure to small aerosol particles,” said the letter.
Bonnema, who was employed in a New York City store and reinstated on March 3 after widespread media attention, asked for better ventilation, with more air changes per hour, and improved filtration. “We should be following the guidelines of scientists who study respiratory transmission,” he wrote. Bonnema did not mention proactive pathogen destruction devices, which dispatch particles to seek out and eliminate the SARS-CoV-2 virus that causes COVID-19.
And Trader Joe’s, in its “Coronavirus Update” on safety steps, made no reference to ventilation, filtration, or more active measures.
David Michaels of George Washington University, one of the 13 authors, Tweeted on Feb. 28, after the Newsweek article appeared: “A reminder to all employers: it is a violation of the Occupational Safety and Health Act to retaliate against a worker for raising safety concerns. Workers often have the best understanding of hazards they face, and how they can, and must, be protected.”
At first, a Trader Joe’s spokesperson said that Bonnema’s “suggestions were listened to” but that he was “terminated…because of the disrespect he showed our customers.” He was then reinstated and the update issued.
A Pill for COVID Patients Who Aren’t Hospitalized
"I'm as enthusiastic about vaccines as anybody you've ever met. But at the same time, I'm a realist," said Francis Collins, director of the NIH in an interview on CBS’s 60 Minutes on March 7. "We know that vaccines are not going to reach everybody across the entire planet in the next couple of weeks. People are going to continue to get sick in the meantime.... We need treatments for those people."
So far, NIH recommends only two pharmaceuticals for treatment of patients hospitalized with COVID-19 and requiring supplemental oxygen: remdesivir, which now goes by the brand name Veklury, and dexamethasone, a corticosteroid used to treat rheumatic problems and other diseases. Both are administered intravenously. But another drug is on the horizon – one that may fill a crucial gap.
“A big need right now,” said Collins, “is for a drug that you could take by mouth, that you could be offered as soon as you have had a positive test, and that would reduce the likelihood that the virus is going to make you really sick.”
The subject of the 60 Minutes segment was just such a drug. Called fluvoxamine, it was approved in 2007 to treat obsessive-compulsive disorder. It has been used and monitored for side effects for over a decade. “Fluvoxamine could certainly be something you want to put in the tool chest,” said Collins. “If it is a way of getting us further towards that goal of having fewer and fewer people really sick from this disease, then we want to pursue it as vigorously as we can.”
Eric Lenze, of the Deparment of Psychiatry at the School of Medicine of Washington University in St. Louis, led a small randomized trial of fluvoxamine that was reported in a peer-reviewed article on Nov. 20 in JAMA, the Journal of the American Medical Association. One of Lenze’s colleagues, a fellow psychiatrist, told him she suspected the drug might work against COVID-19.
The trial found that not a single patient who took fluvoxamine within 7 days of the onset of COVID-19 suffered a clinical deterioration about 15 days, compared with 6 patients, or 8.3% of the sample, who took a placebo. The authors called this difference “statistically significant” but said that determination of clinical efficacy would require larger randomized trials with more definitive outcome measures.” A larger trial is now underway, with 1,100 participants in five sites in the United States and Canada.
One advantage of fluvoxamine besides its being a pill and not an intravenous treatment: It is an inexpensive generic drug.
Meanwhile, another therapeutic, Molnupiravir, is showing promise. The antiviral was originally developed at Emory University and was later acquired by Miami-based Ridgeback Biotherapeutics, which partnered with the global giant Merck & Co. to continue development.
A study published in Science Translational Medicine last April found that the drug “inhibits SARS-CoV-2 in human airway epithelial cell cultures and multiple coronaviruses in mice.” A study in December, published in Nature Microbiology found the drug “blocks SARS-CoV-2 transmission in ferrets.” On March 8, the publication PrecisionVaccinations.com reported:
On January 25, 2021, Merck stated Molnupiravir is currently being evaluated in Phase 2/3 clinical trials in both the hospital and out-patient settings. The primary completion date for the Phase 2/3 studies is May 2021. The company anticipates initial efficacy data in the first quarter of 2021, which Merck plans to share publicly if clinically meaningful.
How a Chain of Alaska Exercise Clubs Encases
Its Members in a Sanitized Envelope
In an interview with station KTUU-TV, the NBC affiliate in Anchorage, Alaska, the CEO of the state’s largest chain of exercise clubs explained how he created “a full envelope sanitizing system” to keep members coming. Robert Brewster, CEO of the Alaska Club said that hand sanitizers, masks, and additional cleanings were obvious operating procedures, but he went much further with “a significant amount of capital improvements.”
They included upgrades for touchless entry, commercial-grade HEPA filters, electrostatic sprayers and foggers as well as “the installation of ActivePure throughout our facilities,” Brewster said, referring to a technology that evolved from the NASA space program in the 1990s and has been cleared by the FDA.
As a result, said Brewster, “we’ve had over 800,000 visits to the facilities since we’ve reopened and the pandemic has been underway, and we’ve had zero reported cases of COVID among our membership or among our employees that seem to have been transferred here at the club.”
Charlie Sokaitis, the KTUU reporter, also interviewed Joseph Urso, CEO of ActivePure Technologies, who explained how his devices at the Alaska Club work using an old video game analogy: “Imagine that you have a million different Pac-Men flying through the air gobbling up pathogens safely while you’re in the room.” Urso said that his company’s devices are being used in hospitals, schools, office buildings, homes, and more.
Brewster said that the Alaska Club has not yet returned to the same level of member activity as before the pandemic, but the gap has started to shrink.
Open Letter in NY Times Urges Biden to Back
Technology to Eliminate COVID Virus in Indoor Air
“Any plan to bring America back must deploy technology that can eliminate SARS- CoV-2, the COVID virus, from interior air – safely and immediately,” stated an open letter to President Biden, published in the New York Times on Feb. 25.
The letter also quoted Linsey Marr, Charles P. Lunsford Professor of Civil and Environmental Engineering at Virginia Tech University, as saying, “It’s time to stop pussyfooting around the fact that the virus is transmitted mostly through the air.” Marr was one of 13 public health experts to sign a letter to Biden’s COVID Coordinator, CDC Director, and Dr. Anthony Fauci, warning of the dangers of contaminated aerosols lingering indoors and calling for action to limit transmission.
Urso, the author of the New York Times open letter, noted that his company has a system “that destroys the COVID virus in the air and [has] deployed it for decades…. It evolved from the NASA space program and is now used by hospitals, schools, offices, restaurants, and other businesses, and in hundreds of thousands of homes.”
Urso added, “By contrast, ventilation does not seek out the virus. Other systems are passive, slow, trap pathogens but don’t destroy them. Many are so dangerous, people can’t even be in the room. By contrast, our technology blasts out sub-microscopic particles that attack viruses and bacteria and destroy them in real time. Our system is safe for people and pets, and it works continuously.
The letter called such technologies, which actively and immediately seek and destroy pathogens, “the missing link.” Urso wrote, “Other U.S. companies may have similar solutions in the future, but spending billions on inferior systems now is wasteful.”
He added, “Every school in America should be benefiting from the science. So should meat-packing plants, grocery stores, health clinics, arenas and restaurants struggling to survive…. Bringing America Back depends on it.”
Providing Health Equity in the Pandemic
This newsletter focuses on innovation in the fight against COVID-19, so it makes sense for us to take note of the way President Biden is addressing the disproportionate impact of the pandemic on America’s most vulnerable communities.
Last month, he announced the members of his COVID-19 Health Equity Task Force. A White House statement said that, with the outbreak of the pandemic, “inequities were quickly evident by race, ethnicity, geography, disability, sexual orientation, gender identity, and other factors.”
The Task Force is headed by Marcella Nunez-Smith, associate professor of medicine and epidemiology at the Yale School of Medicine, where she also founded the Equity Research and Innovation Center. Dr. Nunez-Smith is also one of the three co-chairs of the overall COVID-19 Task Force, announced in November.
In a press conference on Feb. 9, Dr. Nunez-Smith said that the Administration would “be partnering with federally qualified health centers, also known as community centers.” There are more than 1,300 of these around the country, serving 30 million people, two-thirds of whom live at or below the poverty line “and 60 percent of patients…identify as racial or ethnic minorities.” These health centers will now become direct recipients of vaccine doses as soon as next week.
Minorities Twice as Likely to Die
This focus on vulnerable communities is urgent. The CDC reported on Feb. 12 that African Americans were 10% more likely than whites to become infected with COVID-19 and 90% more likely to die. Hispanics were 30% more likely to become infected than whites and 130% more likely to die. Native Americans appear to be most vulnerable of all, by comparison. They are 90% more likely to become infected and 140% more likely to die.
Taken together these three minority groups, are about one-third more likely than whites to become infected but more than three times as likely to be hospitalized and more than twice as likely to die. In other words, when they do get the disease, they get far sicker.
Nor is it a secret that minorities are reluctant to be vaccinated. According to Healthline:
A recent report from UnidosUS, the NAACP, and COVID Collaborative revealed that just 14 percent of Black Americans and 34 percent of Latinx Americans say they have trust in the safety of a new COVID-19 vaccine. The study also found that 18 percent of Black and 40 percent of Latinx respondents say they trust COVID-19 vaccine effectiveness.
One reason is the legacy of the Tuskegee experiments on syphilis treatments, which tested black men for 40 years, through 1972, without their informed consent. Blacks have a history of serving as unwitting guinea pigs in health research. No wonder they are reluctant to try a new vaccine. In addition, in many states, securing a vaccine reservation requires advanced computer skills or the leisure to stay on the phone for hours.
We’re already seeing the results. A Kaiser Family Foundation study looked at the 36 states that report vaccination information by race as of March 1. African Americans and Hispanics are being vaccinated at rates dramatically lower than their proportion of the population. For example, in Washington, DC, Black people represent 45% of the total population and 76% of COVID deaths, but they have received only 26% of the vaccinations. In Georgia, Blacks are 31% of the population, 34% of deaths, and just 19% of vaccinations. In California, Hispanics represent 40% of the population, 46% of COVID deaths and just 19% of vaccinations. In Oregon, Hispanics are 13% of the population, 34% of deaths, and 5% of vaccinations. Similar ratios exists across the states.
Increased efforts are absolutely necessary to encourage African Americans and Hispanics to be vaccinated, but the truth is that any plan to mitigate the greater dangers to vulnerable groups needs to include means to destroy COVID-19 indoors – especially in the close-quarters situations in which many minorities work. Restaurant kitchens, health care settings, grocery stores and meat-packing plants are some obvious examples. In addition, many vulnerable groups live in multi-generational households, where older men and women are exposed to younger children, who are often asymptomatic.
The Equity Task Force also includes James Hildreth, an immunologist who was the first African American full professor in the 125-year history of the Johns Hopkins School of Medicine and who is now president of the Meharry Medical College in Nashville; Mary Turner, president of the Minnesota Nurses Association; and Homer Venters, chief medical officer of the New York City jail system and a faculty member at the New York University School of Medicine.
It’s Unlikely COVID Will Ever Get Out of Our Heads
When will life get back to normal? In an interview with LA Times Today recently, Dr. Fauci said, "Hopefully, by the time we start entering 2022, we really will have a degree of normality that will approximate the kind of normality we've been used to.”
An ABC News piece noted that this was a “departure from previous predictions,” including remarks Fauci gave in January. At a conference hosted by the Association of Performing Arts Professionals, he said, "If everything goes right … by the time we get to the early to mid-fall, you can have people feeling safe performing onstage as well as people in the audience," he said on Jan. 9.
For his part, President Biden, at a CNN Town Hall last month, suggested that life could feel normal again during "Christmas."
In fact, life may never get back to normal if normal means that Americans will be unconcerned about what viruses and other pathogens are floating in the air they breathe, especially indoors. The COVID-19 pandemic has made us conscious of the dangers in the air, and that is something that we can’t really unlearn.
A new awareness of such threats is not necessarily a bad thing. For example, the CDC reports that the influenza rate so far this flu season is only 0.7 per 100,000 population: “This is much lower than average for this point in the season and lower than rates for any season since routine data collection began in 2005, including the low severity 2011-12 season. During that season, rates were 2.3 times higher.
Consider New York state. From Oct. 1, 2019 to April 4, 2020, some 19,713 residents were hospitalized with the flu, but from Oct. 1, 2020 through Feb. 26, 2021, only 183 were hospitalized. There are several reasons for the decline, but one is the increased vigilance inspired by the COVID-19 pandemic. We can expect that vigilance to continue well beyond late fall, or Christmas, or early 2022.
In this issue:
Health Experts Call For Action Against Indoor Airborne Virus
Concern over the lack of a strong policy to combat the airborne transmission of the coronavirus in interior settings is mounting.
A group of 13 public health experts, including such members of President Biden’s own COVID task force as Rick Bright, the former director of the Biomedical Advanced Research and Development Authority, and Michael Osterholm, a highly regarded epidemiologist at the University of Minnesota, called for immediate action to, as the New York Times put it, “limit airborne transmission of the virus in high-risk settings like meatpacking plants and prisons.”
The plea came in a letter Feb. 16 to Rochelle Walensky, director of the Centers for Disease Control and Prevention (CDC); Administration COVID Coordinator Jeff Zients; and Anthony Fauci, director of NIH’s National Institute of Allergy and Infectious Diseases.
The Times quoted Linsey Marr, an expert on aerosols at Virginia Tech, as saying:
It’s time to stop pussyfooting around the fact that the virus is transmitted mostly through the air. If we properly acknowledge this, and get the right recommendations and guidance into place, this is our chance to end the pandemic in the next six months. If we don’t do this, it could very well drag on.
The World Health Organization conceded only in July that the virus can linger in enclosed spaces, and it took the CDC until October to recognize that the virus can sometimes be airborne – “in a puzzling sequence of events in which a description of how the virus spreads appeared on the agency’s website, then vanished, then resurfaced two weeks later,” wrote Aporova Mandavilli of the Times.
Biden Strategy Comprehensive But Not Complete
Also puzzling is the omission in President Biden’s “National Strategy for the COVID-19 Response and Pandemic Preparedness”, issued on Jan. 21, his first full day office.
The document runs 200 pages and covers vaccinations, testing, masking, data-gathering, distancing and treatment. It advocates using the Defense Production Act for personal protective equipment (PPE) and promises to issue clear public health standards. It provides advice on safely reopening schools, businesses, and travel while at the same time protecting workers.
The strategy is certainly comprehensive, but there is no mention of technology for attacking airborne pathogens in enclosed areas. These are the interior spaces in which, according to a paper in the journal Nature, people spend 87% of their time, and, as the CDC puts it, “SARS-CoV-2 viral particles [which cause COVID-19] spread between people more readily indoors than outdoors.”
As a report in the Wall Street Journal stated:
It’s not common to contract Covid-19 form a contaminated surface, scientists say. And fleet encounters with people outdoors are unlikely to spread the corornavirus. Instead, the major culprit is close-up person-person interactions for extended periods.
And those interactions typically occur inside classrooms, hospitals, clinics, restaurants, retail stores, offices, factories, convention halls, movie theaters, gyms, casinos, arenas, and homes.
The good news is that technology exists to eliminate viruses, bacteria, molds, and other dangerous pathogens in interior air.
The bad news is that it is being largely ignored by policy makers. For example, in the Biden strategy document, the word “mask” appears 73 times and “distancing” 28 times, but “air purification” or even “airborne” not once.
Mitigation Through Ventilation?
The only mention of the serious threat of SARS-CoV-2 floating in interior air comes in the text of two executive orders that are part of the strategy document. In one, the President asks for “proper ventilation” in schools, and in the other, he wants “appropriate ventilation” in means of transportation. The document also refers to a request to Congress for $25 billion for personal protective equipment and “ventilation supplies” for “hard-hit child care providers.”
Ventilation is a term that refers to the exchange of air: moving it in and out, replacing old with new. “Ensuring proper ventilation with outside air can help reduce the concentration of airborne contaminants, including viruses, indoors,” says the Environmental Protection Agency. “However, by itself, increasing ventilation is not enough to protect people from COVID-19.”
Ventilation interventions, says the CDC, “can reduce airborne concentration [of SARS-CoV-2], which reduces the overall viral dose to occupants.” Of course, ventilation, as it moves old air out and fresh air in, can also cause pathogens in one part of a room (for example, where an infected person may drinking scotch) to flow to another part of the room (where you may be eating a steak).
But the main point is that ventilation, even if does reduce the concentration of airborne pathogens, is in itself is a crude technology for eliminating SARS-CoV-2. Much better are systems that trap the pathogens in filters, or, better yet, destroy the virus particles outright.
CDC's Guidelines for Schools
Reopening schools is a top priority for the new Administration, and the CDC on Feb. 12 issued an extensive update to its guidelines for schools and child care centers. Again, the emphasis was on masks and social distancing. A separate guide for teachers called “How Do I Set Up My Classroom,” advocated, “Open a door or windows to increase ventilation.” But the CDC warns, “Do not open windows and doors if doing so poses a safety or health risk (e.g., risk of falling, triggering asthma attacks).”
As if it’s not cold enough in a classroom with open windows in February, the teacher guide also advices: “Use fans to increase the effectiveness of open windows.” But again, the CDC has a warning: Don’t position fans in a way in which they can “push potentially contaminated air directly from one person over or to another.”
A Fla. School Charts Its Own Course
What the CDC does not mention is technology that seeks out and destroys pathogens in the air, but this technology has been attracting schools all over the country.
For example, when the 2020-21 school year began, students and teachers at the Pine View School in Osprey, Fla., were eager to get back to the classroom, but they were also worried. The school implemented new safety measures regarding masks, distancing, and hand-washing. But some of the parents had read about air-purification technology to neutralize SARS-CoV-2 in interior spaces. They wanted this extra protection for their children, but the school system was not providing it.
So Courtney Rosenthal, a parent at Pine View School, which educates gifted students in grades 2 through 12 in Sarasota County, started a GoFundMe campaign to purchase stand-alone air-purification units. The campaign raised $70,968 in just 11 days, enough to purchase 130 such units– one for all 112 classrooms at Pine View plus more for other Sarasota County schools that needed them. “It was the domino effect,” said Rosenthal. “The community just came together.”
Rather than blowing air around or trapping pathogens in filters, the technology blasts out sub-microscopic particles that seek out viruses, attack them, and render them harmless.
“I have three kids who go to Pine View and I teach here,” said Pamela Novak, a teacher at the school. “I feel so much safer knowing that my kids, their friends, our teachers, our staff, everyone is going to have that added layer of safety.”
An 11th grader said she had special concerns about COVID-19 because her father is at high risk. “I’ve honestly been really scared about coronavirus. Knowing about the air scrubbers being in my classes makes me feel a lot more safe,” she said.
A little more than halfway through the academic year, students at Pine View are remaining in the classroom for in-person learning without fear while others throughout the country have been forced to move back and forth between virtual learning and in-person learning.
Technology Destroys Airborne COVID Virus Quickly and Safely
The technology that Pine View adopted was highlighted in a Dec. 10 article in the Washington Post by the newspaper’s innovation reporter Dalvin Brown. Called ActivePure, it was developed by a Dallas-based company.
According to Brown of the Post, “While many home-based air purifiers rely on passive HEPA filters or ultraviolet light to kill contaminants, ActivePure uses active, NASA-inspired technology to disinfect the air.”
Standard air purifiers, wrote Brown, “use a fan and filter system that sucks in unclean air, captures contaminants and pushes clean air back into the room.” By contrast, in the ActivePure system, “a fan brings in free oxygen and water molecules and then converts them into special molecules as they pass through an internal UV light.” Using a patented process, the unit then blasts the ionized particles “back out into a room to find and destroy microorganisms.”
The Post article referred to the testing results by FDA-compliant, military-grade Biosafety Levels 3 and 4 laboratories that found that an ActivePure-powered unit, at its lowest setting, destroyed more than 99.9% of a high concentration of SARS-CoV-2 viruses in just three minutes. The article also noted that in June, the FDA gave a Class II Medical Device designation to the company’s Medical Guardian device, used in health care settings.
The Medical Guardian, which is driven by the same technology as all ActivePure devices, was found to safely destroy the six pathogens – two viruses, two bacteria, and two molds – on which it was tested. Included was an MS2 bacteriophage virus whose structure is similar to SARS-CoV-2.
Devices That Address the Experts' Concerns
It’s unclear whether the public health experts who wrote to the CDC are even aware of the ActivePure-driven devices, but the technology would seem to address their concerns. Filters, which are often cited as combatting airborne pathogens, are a slow, passive technology limited by the amount of contaminated air that passes through them.
Devices that are active – that is, send out particles to deactivate viruses – will undoubtedly proliferate in the coming months and years. They are able to destroy SARS-CoV-2 mutations, as well, almost certainly, as pathogens that will cause future pandemics.
COVID Solutions Bulletin
Our mission is to educate people on innovative solutions to the COVID-19 crisis in America. We need to get back to work, to school, to play – to enjoying life. We can’t get there without thwarting the current pandemic and preparing for the possibility of other pathogens to come.
COVID Solutions Bulletin is a publication providing regular updates on new and existing technologies that can help stop the spread of COVID-19, and help clear the air to open America back up.