"Masks don't work for a highly infectious respiratory illness, but also please save them for health workers so they don't get sick" is a pretty dark calibration re: Just Exactly How Stupid Do You Think We Are
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Per Scott Alexander, getting am adequate face seal on a real-deal N-95 surgical mask is actually frustratingly hard. That said, surgical masks help more than zero and don't make a perfect seal.
Makes perfect sense to me that an N95 with a perfect seal is pretty critical for someone working a medical job indoors with a COVID ward. But there's a big difference between that & the needs of someone who is only having brief indoor interactions with a low # of infected people
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It's also a situation where a modest (~50%) reduction in probability of infection from a given contact can make a big difference in how catastrophic an epidemic is.
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Yeah, if you're having 0-5 interactions/week like this vs. 100/day you're going to see a really big difference in impact re: flattening the curve as a result of imperfect interventions. We really do not all have to wear full Chinese medical hazmat in order to slow this thing
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