4/n The study is here https://www.pnas.org/content/early/2020/06/10/2009637117 … Basically, the authors compared the rate of infections before/after mask interventions in three places to a linear trend extrapolation, and found that after masks there were fewer infections than before
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Note the paper claims that masks are effective, and maybe even *sufficient* to stop transmission. It doesn't claim they're *necessary*. A counter-example only works to show a claim of necessity is incorrect. The claims of the paper may be correct and still have counter-examples
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I'm not sure I agree - the paper explicitly argues that other NPIs are insufficient to "protect the public". I'm not sure you can interpret this in any other way tbhpic.twitter.com/ekit7hv5CI
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