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An important takeaway from the article JLC kindly reposted from Medscape Medical News:
"KN95 masks that don't meet US regulatory standards still generally provide more respiratory protection than surgical or cloth masks and can be used in certain clinical settings," Michael Argentieri, ECRI vice president for technology and safety, said in the statement.

Better than surgical masks is a pretty high standard. KN95s without a vent valve are better protection both for the wearer and for those around them than almost anything else that you can find right now, and they are pretty affordable.

An effective national government might publicize the effectiveness of wearing these kind of masks and go ahead and send every person in the US that they can reach by mail a package of several them. With effective national leadership and broad buy-in on wearing quality masks we could squash the COVID pandemic in a matter of months.

There are also Chinese made N95s available now that are NIOSH/CDC certified to US standards: I bought and have been wearing the folding style ones for a month or so. They passed my somewhat superficial inspection as being the genuine NIOSH approved article.
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