This is among the crucial questions - what is minimum effective filtration/fit for ~definitive protection? - of the aerosol debate
If less than N95 is effectively similar, that opens up many low-hanging possibilities for scalable highly protective masks for the publichttps://twitter.com/j_g_allen/status/1293298339694481414 …
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It’s going to be hard to know for sure. We wear surgical masks generally around the hospital but N95 + face shield or PAPR when in the room of a patient with covid. Regardless, the majority of the time we spend in the hospital we are wearing surgical masks and they seem to work?
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I suspect one key shift for hospitals was having all patients mask up (as many started doing sometime in March/April). We saw a lot of healthcare worker infections early on; also more in UK (which has more hospitals with less strict ventilation measures with older buildings) etc.
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