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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Will a cotton/surgical/N95 mask protect one from getting infected? Maybe. N95>surgical mask and it does depend on all the stuff you hear: fit, filtering, etc. Taking care of someone sick, sure, properly-worn N95 if you have one, or surgical or cotton mask. But don't count on it.
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zeynep tufekci Retweeted I Brake 4 Ants
Fine, though everything you hear about the right fit being very important is true for protecting oneself from being infected even though it matters fairly little for transmitting to others—a point people keep missing. Their best bet is staying distant.https://twitter.com/ibrake4ants/status/1251176250682609665 …
zeynep tufekci added,
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zeynep tufekci Retweeted Dan DeRobertis 💋
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 …
zeynep tufekci added,
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Replying to @zeynep
This is not true. Valved masks still trap most droplets.
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Replying to @chadloder
Maybe, depends on design. But not as well as a plain old cotton masks. I've seen some with flaps over it, that's better. But this thing seems to spread fairly well if it can get out even a bit out of the mouth (household transmission, cruise ships, navy ships, restaurants...)
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Replying to @zeynep
Chad Loder Retweeted
The 3M design pictured is the common design, and it will arrest the forward momentum of thw vast majority of droplets. Not ideal, I’ll grant you. But I would rather immunocompromised people wear an N95 valved mask (properly fitted) than a cloth mask. Good thread here: https://twitter.com/MasksForDocs/status/1240849802914496513 …
Chad Loder added,
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Replying to @chadloder
Agree for infection control, but people should understand what they’re doing. Will work in an article explaining all this.
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I can’t believe that article screwed up the explanation like that. This has been a messaging and communication disaster. 
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Replying to @zeynep
This pandemic has really shown why UX, design, and communication strategy are critically important. The WHO and CDC have confused the hell out of everyone at this point
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