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(1) pitifully small study (2) doesn't address asymptomatic spread, and (3) how the disease appears to be particularly virulent during opening stages https://www.sciencenews.org/article/coronavirus-most-contagious-before-during-first-week-symptoms …
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It's a really small study but they also found decreased viral loads, particularly with cotton masks, which might have some importance, no?
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Did they? Median viral load was barely reduced, although one patient was not detectable for cotton masks. Hard to make an assessment with so few patients
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“We do not know whether masks shorten the travel distance of droplets during coughing” isn’t that the key thing?
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That's a biggie. Also appears that the outside of the masks became saturated with virus, which is a big infection risk for donning/doffing and cleaning
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What do you think of this study: https://www.nature.com/articles/s41591-020-0843-2 …
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Much more rigorous, but also showed limited efficacy for masks. This only tested surgical masks, however, which in some ways is less useful at this point
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Extremely timely mask
study
Neither surgical nor cotton masks effectively filtered SARS–CoV-2 during coughs by infected patients