Strikingly from that study, there is a dose-response effect for the significant protection from masks. Dose-response is a pretty big signal. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3322931/ …pic.twitter.com/Zp9sfzzQ75
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(Also you don't have to block at the virion size, it's expelled in the droplet which is considerably bigger. And since you note dose matters, it helps even if most of it is blocked)
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