Example of how the purpose of masks for ordinary people is still not understood. The ones with exhalation valves, including N95s, should not be worn around people, period. Not just in sterile hospital operating rooms as NYT claims. Cotton mask>valved N95.https://www.nytimes.com/interactive/2020/health/coronavirus-best-face-masks.html …
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There are two purposes of masks: protect the wearer from infection AND/OR protect others from wearer's potential transmission. For medical workers, both are important. For regular people in most settings, it's about the latter. Cotton mask will do that; an N95 with valve WON'T.
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If you have extra N95s, please donate them to health workers. They are around people with high viral loads plus do high-risk procedures like intubations which generate aerosols. If you have one with a valve, don't wear it around people. (Maybe ok for taking care of sick person.)
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Medical workers need a great fit, the right mask, proper sanitization etc. because they are trying to PROTECT THEMSELVES FROM BEING INFECTED. AS THEY SHOULD. Ordinary people: we are trying to cut down asymptomatic transmission. A cotton mask, changed often, is awesome for that.
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Replying to @zeynep
What about the old FFP2 mask I have from spraypainting our bed. It has color stains, was worn multiple times. Does it help wearing under a cotton mask?
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Yes. You can leave it in a non-airtight container for a few days to sanitize. But for source control, the cotton mask is fine. I'd wear FFP2 it if I were taking care of someone sick and I had one.
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