In April 2020, Lothar Wieler, head of RKI (German CDC) says first they thought Corona transmitted via droplets. But now, they realise that aerosols are the important vector, & that’s why they recommend masks. Because masks work against aerosols. THIS IS HOW DUMB THEY AREhttps://twitter.com/tomdabassman/status/1406277660595179524 …
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You can catch the coof from aerosols *and* droplets. Cloth masks are somewhat useful against the latter but useless against the former. Which means that cloth masks have some utility if you're going through the grocery for 15 minutes but useless in constant presence of the sick
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Which is precisely why doctors in hospital wards, with a high concentration of aerosols (since the sick are constantly coofing and outputting droplets that will dry out and fill the air with aerosolized naked virus particles) needed actual respirators.
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