"Masks stop respiratory droplets sometimes!" is a ridiculous exercise in surrogate outcomes
We KNOW that masks are unlikely to prevent community acquired infections. THAT'S what we care about, not some statistics on particulate movement #COVID19
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You ought to read Osterhom, Krammer. They both think limited airborne ( and asymptomatic ) transmission is happening ( the bus in China? No one with mask infected, people 15 rows away from index case infected?) We just don't know with this virus, past studies questionable
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Can you link the bus study? I can't find it, one article says it was retracted.
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