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A comment on Everyone wore masks during the 1918 flu pandemic. They were useless. (2020).

Re:Everyone wore masks during the 1918 flu pandemic. They we... by vannevar on Thursday May 13, 2021 @11:52AM (#27143505)
This was an old article from April 2020. With regard to Covid, there is substantial evidence that masks prevent the spread of the virus. See e.g. https://www.thelancet.com/journals/landig/article/PIIS2589-7... and https://www.pnas.org/content/118/4/e2014564118.
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Re:Everyone wore masks during the 1918 flu pandemic. They we... by jjgreen on Thursday May 13, 2021 @12:16PM (#27143885)
Your first reference notes: "Our evidence supports the role of mask-wearing in controlling SARS-CoV-2 transmission; however, this ecological study cannot inform questions of causality or generalisable biological mechanisms. It is difficult to disentangle individuals’ engagement in mask-wearing from their adoption of other preventive hygiene practices, and mask-wearing might be serving as a proxy for other risk avoidance behaviours not queried (eg, avoiding crowded spaces)"
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