Disappointing news on #facemasks for #Covid_19. 4 patients coughed into surgical & cotton masks. Virus found on inner & outer surfaces of both & in petri dish 8" away. Too early to write off masks: amount of virus < than w/o mask, & tiny study. Still. https://annals.org/aim/fullarticle/2764367/effectiveness-surgical-cotton-masks-blocking-sars-cov-2-controlled-comparison …
Replying to @sxbegle
They have a high threshold for "effective". Their data shows that cotton masks reduce the amount of virus detected by 0.71 log copies (ie, down by 80%). That's a gigantic difference in terms of slowing down a pandemic.
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