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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See the picture here? That N95 mask with VALVE has NO OUT FILTER ON ONE'S EXHALE. It doesn't protect other people from one's own potential transmission. If you're high-risk and have a leftover N95 with valve, you can wear a cotton or surgical mask over it.https://twitter.com/chagmed/status/1243611303681327108 …
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Folks, okay. Getting lots of questions. Working now on an article explaining all this (with co-authors including medical experts
). Will update here as well.https://twitter.com/tomgara/status/1251181090477391873 …Show this thread -
For people interested in the science of masks to protect everyone, here’s a detailed article laying it all out. (That’s a preprint, it’s under review).https://twitter.com/zeynep/status/1249805628240953346 …
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Oh, good, the NYT article on masks has been corrected, though they don't note that there has been a correction. Still I'm glad it's corrected!pic.twitter.com/scr7K1TleW
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If your desire is to increase mask wearing (great goal), I’d humbly suggest highlighting this option since valved N95/N99 equivalent plus a cloth mask on top seems likely to protect the wearer more than a cloth mask. Many ordinary people are trying to protect themselves.
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To be clear, I (a layperson, so FWIW) agree with what you’re saying and would donate N95s if I had them. Just trying to recognize reality. Also if everyone had N95s, it wouldn’t matter if they were valved, right (assuming good fit)? Seems like this is still a supply issue in USA.
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