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Title

An evidence review of face masks against COVID-19 (Perspective)

Publication Topics

COVID-19

Publication Type

Journal Article

Publication Date

2020-12-05T08:00:00Z

Author 1

<a onclick="OpenPopUpPage('http:\u002f\u002faskchisne.ucla.edu\u002f_layouts\u002flistform.aspx?PageType=4\u0026ListId={7AAD61FA-4BCB-48C0-B0B7-87AFDC3673EF}\u0026ID=1832\u0026RootFolder=*', RefreshPage); return false;" href="http://askchisne.ucla.edu/_layouts/listform.aspx?PageType=4&amp;ListId={7AAD61FA-4BCB-48C0-B0B7-87AFDC3673EF}&amp;ID=1832&amp;RootFolder=*">Jeremy Howard</a>

Author 2

<a onclick="OpenPopUpPage('http:\u002f\u002faskchisne.ucla.edu\u002f_layouts\u002flistform.aspx?PageType=4\u0026ListId={7AAD61FA-4BCB-48C0-B0B7-87AFDC3673EF}\u0026ID=151\u0026RootFolder=*', RefreshPage); return false;" href="http://askchisne.ucla.edu/_layouts/listform.aspx?PageType=4&amp;ListId={7AAD61FA-4BCB-48C0-B0B7-87AFDC3673EF}&amp;ID=151&amp;RootFolder=*">et al</a>

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Abstract

​Summary: The science around the use of masks by the public to impede COVID-19 transmission is advancing rapidly. In this narrative review, authors develop an analytical framework to examine mask usage, synthesizing the relevant literature to inform multiple areas: population impact, transmission characteristics, source control, wearer protection, sociological considerations, and implementation considerations. A primary route of transmission of COVID-19 is via respiratory particles, and it is known to be transmissible from presymptomatic, paucisymptomatic, and asymptomatic individuals. Reducing disease spread requires two things: limiting contacts of infected individuals via physical distancing and other measures and reducing the transmission probability per contact. ​

FindingsThe preponderance of evidence indicates that mask wearing reduces transmissibility per contact by reducing transmission of infected respiratory particles in both laboratory and clinical contexts. Public mask wearing is most effective at reducing spread of the virus when compliance is high. Given the current shortages of medical masks, authors recommend the adoption of public cloth mask wearing, as an effective form of source control, in conjunction with existing hygiene, distancing, and contact tracing strategies. Because many respiratory particles become smaller due to evaporation, authors recommend increasing focus on a previously overlooked aspect of mask usage: mask wearing by infectious people (“source control”) with benefits at the population level, rather than only mask wearing by susceptible people, such as health care workers, with focus on individual outcomes. 

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An evidence review of face masks against COVID-19

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