if this works, doesn't this imply a lot of the exhaled breath is unfiltered?https://twitter.com/MDiPaolaMD/status/1293311712507166720 …
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As you likely know, even masks that are say 50% effective at filtering are still quite effective at reducing the spread of Covid-19 in the population if enough people wear them: https://youtu.be/Y47t9qLc9I4
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yes
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