Scientific Evidence that Masks Reduce SARS-CoV-2 Transmission:
Peer Reviewed and Published papers

This painting shows a cross section through a small respiratory 
droplet, like the ones that are thought to transmit SARS-CoV-2. The
virus is shown in magenta, and the droplet is also filled with 
molecules that are present in the respiratory tract, including mucins
(green), pulmonary surfactant proteins and lipids (blue), and
antibodies (tan).

There are now a number of peer reviewd published scientific papers that demonstrate that wearing masks works to reduce SARS-CoV-2 Transmission. If you do not believe this, then:

Otherwise, please stop making a fool of yourself in public.

Masks must cover the nose!!!! See:
Facebook | CDC

If you are not familiar with how science works read:
How Science Works

Note: If you find errors on this page (broken links, misspellings etc) please report them to me.


  1. WATCH THIS ONE!!!!!
    Slow Motion Sneeze in 4K - The Slow Mo Guys with Dr Anthony Fauci
    Oct 22, 2020
  2. How Well Do Masks Work?
  3. COVID-19 & Mask Myths DEBUNKED!
  4. Bill Nye explains masks and why you should wear them.
  5. COVID-19 and Influenza Dr. Fauci discusses the status of the COVID-19 pandemic; Dr. Taubenberger discuses the status of the emerging influenza season, as well as the 1918-1919 flu. Tuesday, January 12. (link after it is over)

Scientific Publications

  1. PUBLISHED EDITORIAL: A study in PLOS Medicine found that the combination of mask-wearing, social distancing, and hand washing are the best measures to mitigate the pandemic. There is compelling evidence that these public health measures work. Can self-imposed prevention measures mitigate the COVID-19 epidemic?
  2. PEER REVIEWED PUBLISHED PAPER: A scientific study for why you should wash, wear a mask and distance: Impact of self-imposed prevention measures and short-term government-imposed social distancing on mitigating and delaying a COVID-19 epidemic: A modelling study. PLoS Med. 2020;17(7): e1003166.
    "Our results suggest that information dissemination about COVID-19, which causes individual adoption of handwashing, mask-wearing, and social distancing, can be an effective strategy to mitigate and delay the epidemic."
  3. PEER REVIEWED PUBLISHED PAPER: Face mask use in the general population and optimal resource allocation during the COVID-19 pandemic Nature Communications. "In this study, we have shown that face mask use in the general population can have a beneficial impact in reducing the total number of infections and deaths, and that this impact naturally increases with mask effectiveness."
  4. PEER REVIEWED PUBLISHED REVIEW PAPER: Coronavirus Disease 2019-COVID-19 2020 Jun 24
  5. PEER REVIEWED PUBLISHED PAPER: Community Use Of Face Masks And COVID-19: Evidence From A Natural Experiment Of State Mandates In The US Health Affairs.
  6. PEER REVIEWED PUBLISHED REVIEW PAPER: In-flight transmission of SARS-CoV-2: a review of the attack rates and available data on the efficacy of face masks Journal of Travel Medicine.
  7. PEER REVIEWED PUBLISHED PAPER: Effectiveness of Face Masks in Preventing Airborne Transmission of SARS-CoV-2 mSphere. Accepted October 1, 2020.
  8. PUBLISHED EDITORIAL: Preventing the Spread of SARS-CoV-2 With Masks and Other "Low-tech"Interventions JAMA: Journal of the American Medical Association. 2020 Oct 27
  9. PEER REVIEWED PUBLISHED PAPER: Effectiveness of Cloth Masks for Protection Against Severe Acute Respiratory Syndrome Coronavirus 2 Emerging Infectious Diseases. 2020 Oct 30
  10. PEER REVIEWED PUBLISHED PAPER: Causal impact of masks, policies, behavior on early covid-19 pandemic in the U.S. Journal of Econometrics. WEARING MASKS WOULD HAVE SAVED 19 to 47 thousand lives! See also the Article in MIT TECH Review.
  11. PEER REVIEWED PUBLISHED PAPER: Trends in County-Level COVID-19 Incidence in Counties With and Without a Mask Mandate --- Kansas, June 1 --- August 23, 2020
    "The governor of Kansas issued an executive order requiring wearing masks in public spaces, effective July 3, 2020, which was subject to county authority to opt out. After July 3, COVID-19 incidence decreased in 24 counties with mask mandates but continued to increase in 81 counties without mask mandates."
  12. PEER REVIEWED PUBLISHED PAPER: A cluster randomised trial of cloth masks compared with medical masks in healthcare workers It's pretty obvious - medical masks work better. But that doesn't mean one should not wear a cloth mask!
  13. PEER REVIEWED PUBLISHED PAPER: Face masks considerably reduce COVID-19 cases in Germany Proceedings of the National Academy of Sciences of the United States of America. "Weighing various estimates, we conclude that 20 d after becoming mandatory face masks have reduced the number of new infections by around 45%." First published December 3, 2020. This is one of the most respected journals in all science.
  14. PEER REVIEWED PUBLISHED PAPER: Effect of sneezing on the flow around a face shield Physics of Fluids 32, 127105 (2020). Published Online: 08 December 2020.
    A face shield alone is not enough!
  15. PEER REVIEWED PUBLISHED PAPER: Physical distancing, face masks, and eye protection to prevent person-to-person transmission of SARS-CoV-2 and COVID-19: a systematic review and meta-analysis
    A Lancet (top medical journal) meta study of 172 other studies concluded:
    "Face mask use could result in a large reduction in risk of infection".
  16. PEER REVIEWED PUBLISHED PAPER: Association of Country-wide Coronavirus Mortality with Demographics, Testing, Lockdowns, and Public Wearing of Masks
    The American Journal of Tropical Medicine and Hygiene
  17. PEER REVIEWED PUBLISHED PAPER: Evaluation of Cloth Masks and Modified Procedure Masks as Personal Protective Equipment for the Public During the COVID-19 Pandemic. JAMA Internal Medicine. December 10, 2020
    "this study demonstrates that the FFEs of consumer-grade masks available to the public are, in many cases, nearly equivalent to or better than their non-N95 respirator medical mask counterparts."
  18. PEER REVIEWED PUBLISHED PAPER: Reduction of secondary transmission of SARS-CoV-2 in households by face mask use, disinfection and social distancing: a cohort study in Beijing, China.
    "Face mask use by the primary case and family contacts before the primary case developed symptoms was 79% effective in reducing transmission"
    "Wearing a mask after illness onset of the primary case was not significantly protective." !!!
  19. PEER REVIEWED PUBLISHED PAPER: Effects of mask-wearing on the inhalability and deposition of airborne SARS-CoV-2 aerosols in human upper airway.
    Physics of Fluids.


Preprints are publications that have not gone through peer review. They may contain flaws or they may be fine. I will try to locate the final publication when possible.
  1. PREPRINT: Face Masks Against COVID-19: An Evidence Review [Not published as of 2020 Dec 12.]
  2. PREPRINT: The Effects of Large Group Meetings on the Spread of COVID-19: The Case of Trump Rallies
    Conclusion of the paper (my emphasis):
    Our analysis strongly supports the warnings and recommendations of public health officials concerning the risk of COVID-19 transmission at large group gatherings, particularly when the degree of compliance with guidelines concerning the use of masks and social distancing is low. The communities in which Trump rallies took place paid a high price in terms of disease and death.
    [Not published as of 2020 Dec 12.]
  3. PREPRINT Information Revelation of Decentralized Crisis Management: Evidence from Natural Experiments on Mask Mandates (PDF). [Not published as of 2020 Dec 12.]
  4. PREPRINT Inward and outward effectiveness of cloth masks, a surgical mask, and a face shield [Not published as of 2020 Dec 12.]


  1. NEWS: 'Near extinction' of influenza in NZ as numbers drop due to lockdown
  2. NEWS: Nature NEWS FEATURE 06 October 2020
    Face masks: what the data say
    The science supports that face coverings are saving lives during the coronavirus pandemic, and yet the debate trundles on. How much evidence is enough?
  3. NEWS 2020 Oct 29 'Natural experiment' paints clear picture: Masks work.
  4. NEWS: A room, a bar and a classroom: how the coronavirus is spread through the air Demonstration of how COVID-19 is spread. Reported 2020-10-28.
    2020 Oct 29
  5. NEWS: An analysis of three Covid-19 outbreaks: how they happened and how they can be avoided Demonstration of how COVID-19 is spread. Reported 18 jun 2020 - 02:34 EDT.
    2020 Oct 29
  6. NEWS COVID-19 Outbreak at an Overnight Summer School Retreat - Wisconsin, July-August 2020
    MMWR: Morbidity & Mortality Weekly Report. 2020 Oct 30
    What is already known about this topic?
    SARS-CoV-2 can spread rapidly in congregate settings such as overnight camps.
    What is added by this report?
    During July 2-August 11, 2020, a COVID-19 outbreak at an overnight high-school retreat likely began with a single student who had received a negative SARS-CoV-2 molecular test result <1 week before the retreat and led to 116 (76%) diagnosed COVID-19 cases among attendees
    Summary: Kid gets tested, is negative, catches it, NO MASK, NO DISTANCING ... gives COVID-19 to 116 other people!!!
  7. NEWS: Covid-19 becomes personal in a South Dakota town as neighbors die and the town debates a mask mandate
    "Maskless residents walk past storefronts in Mitchell, S.D., on Nov. 22. A day later, the city council voted on a citywide mask mandate." (KC McGinnis for The Washington Post) By Annie Gowen December 9, 2020" 2020 Dec 10
  8. NEWS Military-grade camera shows risks of airborne coronavirus spread 2020 Dec 11
  9. NEWS Scientific Brief: Community Use of Cloth Masks to Control the Spread of SARS-CoV-2 CDC Nov. 20, 2020. This report has 45 references to teh scientific literature. 2020 Dec 12

Links for Research

Legal Rules

  1. Masks Are Legal, Dummy | LegalEagle's Real Law Review
  2. Jailed for not wearing mask in South Africa. SOME countries are doing the right thing! Jan 1, 2021, Koolo Hinde TV.

Example Scams and Lies

  1. The Rachel Maddow Show. "It is not true that 85% of people who wear masks get Covid. That is absolutely bunk." (See the video)
    • Original CDC SCIENTIFIC report:
    • Original scam NOT SCIENTIFIC report:
    • Explanation of how the SCAM worked as given in the comments on that page:
      Alanso18 min
      The report findings are being distorted to support the dangerous whining about mask weating[sic]. The study specifically pointed out that all of those testing positive had participated in activities where mask wearing was not possible or adhered to, such as dining out (50%) gymn, church, bars, etc. In other words, NOT wearing a mask on those occasions caused the infection, despite wearing 85% wearing masks regularly outside tyese activities. Distorting facts is a common propoganda technique that fools those who allow others to define information for them, rather than investigate for themselves. Read the CDC report, it in no way states that masks are ineffective.
  2. FALSE CLAIM: Masks Don't Work: A Review of Science Relevant to COVID-19 Social Policy by Denis Rancourt
    • Denis Rancourt at Wikipedia
      "Rancourt is a recognized scientist but is more widely known for his confrontations with his former employer, the University of Ottawa, over issues involving his grade inflation and "academic squatting," the act of arbitrarily changing the topic of a course without departmental permission."
    • A Complete Debunking of Denis Rancourt's Mask Don't Work David Kyle Johnson, July 2020


  1. You don't need a mask because ...

Tom Schneider's Home Page
origin: 2020 Oct 15
updated: 2021 Jan 14