Let& #39;s review this mask thing one more time.

Studies on the effectiveness of face masks (via our friends at Swiss Policy Research and our dutiful writers at @Rational_Ground )

https://swprs.org/face-masks-evidence/
https://swprs.org/face-mask... href=" https://rationalground.com/mask-studies/ 

Here.">https://rationalground.com/mask-stud... We. Go.
1/
Mask studies

Some of the studies below recommend the use of masks after stating there is no strong evidence supporting their use. When the recommendation of a paper conflicts with the evidence stated, we provid…

https://swprs.org/face-masks-evidence/
So far, most studies found little to no evidence for the effectiveness of cloth face masks in the general population, neither as personal protective equipment nor as a source control.
2/
A May 2020 meta-study on pandemic influenza published by the US CDC found that face masks had no effect, neither as personal protective equipment nor as a source control.
https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
3/">https://wwwnc.cdc.gov/eid/artic...
Nonpharmaceutical Measures for Pandemic Influenza in Nonhealthcare Settings—Personal Protective and...

There were 3 influenza pandemics in the 20th century, and there has been 1 so far in the 21st century. Local, national, and international health autho...

https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
A July 2020 review by the Oxford Centre for Evidence-Based Medince found that there is no evidence for the effectiveness of cloth masks against virus infection or transmission.
https://www.cebm.net/covid-19/masking-lack-of-evidence-with-politics/
4/">https://www.cebm.net/covid-19/...
Masking lack of evidence with politics - CEBM

Tom Jefferson, Carl Heneghan The increasing polarised and politicised views 1 on whether to wear masks in public during the

https://www.cebm.net/covid-19/masking-lack-of-evidence-with-politics/
A Covid-19 cross-country study by the University of East Anglia found that a mask requirement was of no benefit and could even increase the risk of infection.
https://www.medrxiv.org/content/10.1101/2020.05.01.20088260v1.full.pdf
5/">https://www.medrxiv.org/content/1...
An April 2020 review by two US professors in respiratory and infectious disease from the University of Illinois concluded that face masks have no effect in everyday life, neither as self-protection nor to protect third parties.
https://www.cidrap.umn.edu/news-perspective/2020/04/commentary-masks-all-covid-19-not-based-sound-data
6/">https://www.cidrap.umn.edu/news-pers...
COMMENTARY: Masks-for-all for COVID-19 not based on sound data

The evidence does not conclusively favor using masks, whether homemade or surgical, to protect against the disease.

https://www.cidrap.umn.edu/news-perspective/2020/04/commentary-masks-all-covid-19-not-based-sound-data
An article in the New England Journal of Medicine from May 2020 came to the conclusion that cloth face masks offer little to no protection in everyday life.
https://www.nejm.org/doi/full/10.1056/NEJMp2006372
7/">https://www.nejm.org/doi/full/...
Universal Masking in Hospitals in the Covid-19 Era | NEJM

Perspective from The New England Journal of Medicine — Universal Masking in Hospitals in the Covid-19 Era

https://www.nejm.org/doi/full/10.1056/NEJMp2006372
An April 2020 Cochrane review (preprint) found that face masks didn’t reduce influenza-like illness (ILI) cases, neither in the general population nor in health care workers.
https://www.medrxiv.org/content/10.1101/2020.03.30.20047217v2
8/">https://www.medrxiv.org/content/1...
Physical interventions to interrupt or reduce the spread of respiratory viruses. Part 1 - Face...

Abstract OBJECTIVE: To examine the effectiveness of eye protection, face masks, or person distancing on interrupting or reducing the spread of respiratory viruses. DESIGN: Update of a Cochrane review...

https://www.medrxiv.org/content/10.1101/2020.03.30.20047217v2
An Apr 2020 review by the Norwich School of Medicine (preprint) found that “the evidence is not sufficiently strong to support widespread use of facemasks”, but supports the use of masks by “particularly vulnerable individuals”
https://www.medrxiv.org/content/10.1101/2020.04.01.20049528v1
9/">https://www.medrxiv.org/content/1...
Facemasks and similar barriers to prevent respiratory illness such as COVID-19: A rapid systematic...

The current pandemic of COVID-19 has lead to conflicting opinions on whether wearing facemasks outside of health care facilities protects against the infection. To better understand the value of...

https://www.medrxiv.org/content/10.1101/2020.04.01.20049528v1
A July 2020 study by Japanese researchers found that cloth masks “offer zero protection against coronavirus” due to their large pore size and generally poor fit.
http://www.asahi.com/ajw/articles/13523664
10/">https://www.asahi.com/ajw/artic...
Cloth face masks offer zero shield against virus, a study shows : The Asahi Shimbun

Cloth face masks, often cobbled together as a makeshift alternative when stocks of surgical masks ru

http://www.asahi.com/ajw/articles/13523664
A 2015 study in the British Medical Journal BMJ Open found that cloth masks were penetrated by 97% of particles and may increase infection risk by retaining moisture or repeated use.
https://bmjopen.bmj.com/content/5/4/e006577
11/">https://bmjopen.bmj.com/content/5...
A cluster randomised trial of cloth masks compared with medical masks in healthcare workers

Editor's Note The authors of this article, published in 2015, have written a response to their work in light of the COVID-19 pandemic. We urge our readers to consider the response when reading the...

https://bmjopen.bmj.com/content/5/4/e006577
An Aug 2020 review by a German professor in virology, epidemiology and hygiene found that there is no evidence for the effectiveness of cloth face masks and that the improper daily use of masks by the public may in fact lead to an increase in infections
https://www.thieme-connect.com/products/ejournals/html/10.1055/a-1174-6591
12">https://www.thieme-connect.com/products/...
CDC: “Although mechanistic studies support the potential effect of hand hygiene or face masks, evidence from 14 randomized controlled trials of these measures did not support a substantial effect on transmission of laboratory-confirmed influenza.”
https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article?fbclid=IwAR2V1hPqN0WKb2kXVExP_1UE9ARvru6mtPZvZN0w1jx0S3l3fXLhxMP_bXs
13/">https://wwwnc.cdc.gov/eid/artic...
Nonpharmaceutical Measures for Pandemic Influenza in Nonhealthcare Settings—Personal Protective and...

There were 3 influenza pandemics in the 20th century, and there has been 1 so far in the 21st century. Local, national, and international health autho...

https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article?fbclid=IwAR2V1hPqN0WKb2kXVExP_1UE9ARvru6mtPZvZN0w1jx0S3l3fXLhxMP_bXs
WHO: “Many countries have recommended the use of fabric masks/face coverings for the general public. At the present time, the widespread use of masks by healthy people in the community setting is not yet supported by high quality... evidence..."

https://www.who.int/publications/i/item/advice-on-the-use-of-masks-in-the-community-during-home-care-and-in-healthcare-settings-in-the-context-of-the-novel-coronavirus-(2019-ncov)-outbreak
14/">https://www.who.int/publicati...
Advice on the use of masks in the community, during home care and in healthcare settings in the...

Interim guidance

https://www.who.int/publications/i/item/advice-on-the-use-of-masks-in-the-community-during-home-care-and-in-healthcare-settings-in-the-context-of-the-novel-coronavirus-(2019-ncov)-outbreak
WHO in Aug: “Evidence on the benefits and harms of children wearing masks to mitigate transmission of COVID-19 and other coronaviruses is limited.”
https://www.who.int/publications/i/item/WHO-2019-nCoV-IPC_Masks-Children-2020.1
15/">https://www.who.int/publicati...
Advice on the use of masks for children in the community in the context of COVID-19

Annex to the Advice on the use of masks in the context of COVID-19

https://www.who.int/publications/i/item/WHO-2019-nCoV-IPC_Masks-Children-2020.1
And then there& #39;s the much anticipated Danish study. @andrewbostom has the rundown: https://twitter.com/andrewbostom/status/1319233804725342208">https://twitter.com/andrewbos...
You can follow @justin_hart.
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