Royal Statistical Society on Twitter. (n.d.). Twitter. Retrieved October 25, 2020, from https://twitter.com/RoyalStatSoc/status/1317133702183456769

Take away: Cloth face masks filter approximately 50% of bacteriophage five times smaller than one SARS-CoV-2 virus. Therefore it is reasonable to assume that masks, including cloth masks, are 50% effective.

The claim: Masks are assumed to be 50% effective.

The evidence: Face masks, including home made face masks, were shown to reduce aerosol exposure (1). Masks made from various materials were shown to filter 50-68% of Bacteriophage CS2 which is 20 nm (2). When NaCl aerosols were used instead of a bacteriophage, penetration by NaCl occurred 9-98% of the time depending on the size of the particles (3). Two well written reviews detail the efficacy of facemasks (4, 5). SARS-CoV-2 virus is ~100 nm in size (6).

Sources: 1 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440799/

2 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7108646/

3 https://academic.oup.com/annweh/article/54/7/789/202744

4 https://www.preprints.org/manuscript/202004.0203/v1

5 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7497125/#ref23

6 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7224694/#:~:text=SARS%2DCoV%2D2%20is%20an,they%20do%20more%20than%20that.

Abraar Karan: Politics and public health in America—taking a stand for what is right. (2020, October 9). The BMJ. https://blogs.bmj.com/bmj/2020/10/09/abraar-karan-politics-and-public-health-in-america-taking-a-stand-for-what-is-right/

Take away:

If correct numerators and denominators are used, COVID-19 is at least 10 times as deadly as seasonal influenza.

The claim:

The Infection Fatality Ratio for COVID-19 is “approximately 2.5 times higher than the estimated IFR for seasonal influenza.”

The evidence:

Blackburn et al. report an infection fatality ratio among community-living adults of 0.26% (1). If institutionalized adults had been included the ratio would be higher, likely approximating the 0.6% mortality rate among exposed individuals readily calculated by combining official death tolls, the known 30% undercount (2), and a definitive CDC study that found 10 times as many people have been exposed to the novel coronavirus than are reported as cases (3). Among the elderly, Blackburn et al. calculate COVID-19 is 2.5 times deadlier than seasonal flu. This is clearly an underestimate:

1) Blackburn et al. use CDC estimates of case-fatality rates calculated on the basis of all Americans, including the institutionalized, not limited to much healthier community-dwellers.

2) The seasonal influenza case fatality rates reported by the CDC, including the often cited 0.1% overall, are for symptomatic cases. Their denominators are estimated by using the reported number of influenza hospitalizations to guess the burden of clinical illness (4). But antibody studies show that 65%-85% of people infected with influenza never develop symptoms (5). The 0.6% mortality rate calculated here for SARS-CoV-2-exposed individuals is 6 times higher than the 0.1% usually cited for seasonal influenza. Given the overestimation of commonly accepted influenza mortality rates due to failure to take asymptomatic infections into account, SARS-CoV-2 can be seen to be not 2.5 times, or even 6 times, but at least 10 times as lethal as seasonal flu.

Sources:

1 http://www.acpjournals.org/doi/10.7326/M20-5352

2 https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2767980

3 https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2768834

4 https://www.cdc.gov/flu/about/burden/how-cdc-estimates.htm

5 https://pubmed.ncbi.nlm.nih.gov/26133025/

Kavanagh, M. M. (2020). US elections and a foreign policy for pandemics. The Lancet Public Health, 5(10), e517–e518. https://doi.org/10.1016/S2468-2667(20)30211-5

Covid-19: Is Behavioural Science The Key To Handle The Pandemic? (n.d.). Retrieved October 10, 2020, from https://www.psychologs.com/article/covid-19-is-behavioral-science-the-key-to-handle-the-pandemic

Take Away: The new scientific paper confirms earlier modeling work and should not be interpreted as a detailed prediction for future deaths due to the ongoing pandemic.

The Claim: "A scientific review of the science behind lockdown concludes the policy was a MISTAKE & will have caused MORE deaths from Covid-19"

The Evidence: The scientific process involves replication and confirmation of experiments and studies. A new paper replicates and expands on an early modeling study of the COVID-19 pandemic in England (1). Their findings support the earlier results. However, there are limitations to the replication paper, which does not accurately reflect the current state of the pandemic response and does not make detailed predictions for a second wave of infections and deaths.

A recent expert response to the paper further explains (2):

"It needs to be stressed that all the simulations assume that interventions are only in place for 3 months (18th April – 18th July) and then completely relaxed. This gives rise to a strange set of scenarios where a second wave is allowed to progress in an uncontrolled manner."

“It is this that leads to the counter-intuitive headline finding “that school closures would result in more overall covid-19 deaths than no school closures” – actually what the authors find is that a short period of intense lock-down (including the closure of schools) leads to a large second wave if it is allowed to run with no controls. To be fair the authors do highlight this in the paper, but it is not in the reported press release." -Prof Matt Keeling, Professor of Populations and Disease, University of Warwick

Sources:

(1) https://www.bmj.com/content/371/bmj.m3588

(2) https://www.sciencemediacentre.org/expert-reaction-to-reanalysis-of-model-used-for-imperial-report-9-and-impact-of-school-closures/

Take away: This model excludes the possibility of vaccination. As many vaccines are in stage three clinical trials, the conclusion that more people will die from closing schools, etc. will most likely not be realized.

The claim: School closures and isolation of younger people will increase total number of deaths from second and subsequent waves of COVID-19 when restrictions are lifted.

The evidence: This model predicts more deaths from the combination of place closures such as schools, case isolations, household quarantine, and social distancing of over 70s than for the combination of case isolation, household quarantine, and social distancing for over 70s. The majority of the deaths for the combination of place closures, case isolations, household quarantine, and social distancing of over 70s occur once the restrictions are lifted. This model excludes the possibility of a vaccine reducing the size of the second wave.

At least ten companies have a COVID-19 vaccine in the final stage (Phase III) of clinical trials (1). Therefore a model which excludes vaccination will most likely not be accurate to reality once a vaccine is widely administered.

Source:

1 https://www.who.int/publications/m/item/draft-landscape-of-covid-19-candidate-vaccines

Bozorgmehr, K. (2020). Power of and power over COVID-19 response guidelines. The Lancet, 0(0). https://doi.org/10.1016/S0140-6736(20)32081-X

IZA – Institute of Labor Economics. ‘COVID-19 and the Labor Market’. Accessed 6 October 2020. https://covid-19.iza.org/publications/dp13707/.

IZA – Institute of Labor Economics. ‘COVID-19 and the Labor Market’. Accessed 6 October 2020. https://covid-19.iza.org/publications/dp13683/.

Kaplan, Edward H, Dennis Wang, Mike Wang, Amyn A Malik, Alessandro Zulli, and Jordan H Peccia. ‘Aligning SARS-CoV-2 Indicators via an Epidemic Model: Application to Hospital Admissions and RNA Detection in Sewage Sludge’. Preprint. Infectious Diseases (except HIV/AIDS), 29 June 2020. https://doi.org/10.1101/2020.06.27.20141739.

COVID-19 and the Politics of Reproductive Health: Global Perspectives. (2020, August 18). https://www.youtube.com/watch?v=Kex9O_cwMwo

Covid: Cardiff and Swansea go into local lockdown—BBC News. (n.d.). Retrieved September 29, 2020, from https://www.bbc.co.uk/news/uk-wales-54310400

Learning lessons before launching an inquiry—IfG LIVE 2020 Labour Fringe Programme—YouTube. (n.d.). Retrieved September 29, 2020, from https://www.youtube.com/watch?v=cCZl-naQ6UM

Take away: Mass infection without vaccination to achieve herd immunity will result in millions of deaths based on the observed death rate and may not result in herd immunity due to virus mutation. Historically, vaccination results in less deaths than the disease.

The claim: Herd immunity from widespread disease instead of vaccination will lead to many people dying.

The evidence: Approximately 50-67% of a given population is estimated to need to be infected for herd immunity to COVID-19 to exist which will result in millions of deaths. This is supported by additional publications (1, 2). This number assumes that the virus will not mutate to the point where re-infection is possible. If mutation occurs, COVID could become established in the general population similar to influenza or the common cold (3). A third publication estimates a needed infected percentage of 29-74% (4). These publications support the statement that millions will die if herd immunity is achieved via infection without vaccination. Historically, vaccination results in fewer deaths/disease on a population level than the disease for which the vaccine is designed to prevent (5-7).

Sources:

1 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7314002/

2 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7262166/pdf/JMV-9999-na.pdf

3 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7164482/

4 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/A1480DAE803D4CD4A3E9F79B82309584/S1935789320001913a.pdf/covid19_reflections.pdf

5 https://pubmed.ncbi.nlm.nih.gov/28708957/

6 https://pubmed.ncbi.nlm.nih.gov/29668817/

7 https://pubmed.ncbi.nlm.nih.gov/12531323/

Take away: People are infectious for only part of the time they test positive. The tests for COVID-19 were granted emergency status by the FDA so some debate concerning the most ideal number of cycles is to be expected. It is worth noting that the FDA has the disclaimer "Negative results do not preclude 2019-nCoV infection and should not be used as the sole basis for treatment or other patient management decisions. Negative results must be combined with clinical observations, patient history, and epidemiological information (2)."

The claim: Up to 90 percent of people diagnosed with coronavirus may not be carrying enough of it to infect anyone else

The evidence: Per Walsh et al. (1), SARS-CoV-2 virus (COVID-19) is most likely infectious if the number of PCR cycles is <24 and the symptom onset to test is <8 days. RT-PCR detects the RNA, not the infectious virus. Therefore, setting the cycle threshold at 37-40 cycles will most likely result in detecting some samples with virus which is not infectious. As the PCR tests were granted emergency use by the FDA (samples include 2-9), it is not surprising that some debate exists currently about where the cycle threshold should be. Thresholds need to be set and validated for dozens of PCR tests currently in use. If identifying only infectious individuals is the goal, a lower cycle number may be justified. If detection of as many cases as possible to get closer to the most accurate death rate is the goal, setting the cycle threshold at 37-40 makes sense. A lower threshold will result in fewer COVID-19 positive samples being identified. It is worth noting that the emergency use approval granted by the FDA includes the disclaimer that a negative test does not guarantee that a person is not infected with COVID-19. RNA degrades easily. If samples are not kept cold or properly processed, the virus can degrade and result in a false negative result.

Source: 1 https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciaa638/5842165

2 https://www.fda.gov/media/134922/download

3 https://www.fda.gov/media/138150/download

4 https://www.fda.gov/media/137120/download

5 https://www.fda.gov/media/136231/download

6 https://www.fda.gov/media/136472/download

7 https://www.fda.gov/media/139279/download

8 https://www.fda.gov/media/136314/download

9 https://www.fda.gov/media/140776/download

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Aum, S., Lee, S. Y. (Tim), & Shin, Y. (2020). Inequality of Fear and Self-Quarantine: Is There a Trade-off between GDP and Public Health? (Working Paper No. 27100; Working Paper Series). National Bureau of Economic Research. https://doi.org/10.3386/w27100

Berger, D. W., Herkenhoff, K. F., & Mongey, S. (2020). An SEIR Infectious Disease Model with Testing and Conditional Quarantine (Working Paper No. 26901; Working Paper Series). National Bureau of Economic Research. https://doi.org/10.3386/w26901

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Malani, A., Soman, S., Asher, S., Novosad, P., Imbert, C., Tandel, V., Agarwal, A., Alomar, A., Sarker, A., Shah, D., Shen, D., Gruber, J., Sachdeva, S., Kaiser, D., & Bettencourt, L. M. A. (2020). Adaptive Control of COVID-19 Outbreaks in India: Local, Gradual, and Trigger-based Exit Paths from Lockdown (Working Paper No. 27532; Working Paper Series). National Bureau of Economic Research. https://doi.org/10.3386/w27532

Take away: As with most things in nature, there are always exceptions – transmission occurring at greater distances than 3 ft and evidence of aerosolization have been reported.

Discussion: In scientific terms, this virus is still very new so the data supporting an optimal physical distance to prevent transmission remains scarce. In the absence of data, public health agencies have used what they understand about this virus and similar viruses to infer a “best” answer. Public health agencies try to simplify the recommendation to a single answer, but the reality is much more complex.

According to reports the WHO bases their recommendation for 1 meter (~3 ft) distancing off of an understanding that SARS-CoV-2 behaves like similar respiratory viruses that are primarily transmitted via larger droplets (as opposed to smaller aerosols). Assuming most spread is via droplets, the WHO reportedly follows the results of a 1934 study indicating most respiratory droplets fall to the ground within 3 feet.

However, as with most things in nature, there are always exceptions – transmission occurring at greater distances than 3 ft and evidence of aerosolization have been reported.

The evidence basis for the CDCs guidance for 6 feet of separation is less clear, but probably reflects lower risk tolerance, or greater weight to evidence of aerosolization or wider droplet spread.

Even with further study, there may never be a clear answer for optimal physical distancing. This is because, (1) the area of high risk for transmission is probably dependent on the specific conditions of the interaction (e.g. loud talking, windy environment), and (2) the “optimal” distance is based on risk tolerance. There is no single distance between individuals where risk of transmission drops off precipitously to zero.

All evidence indicates that greater distances are safer but, for example, consider how restrictive a physical distancing recommendation of >50 ft would be. In the end, because we can’t control how far others stand away from us, we ask governments to consider these tradeoffs and deliver a “best” answer to guide their citizenry.

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COVID-19 Social Science Tracker - Google Sheets

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