Experts in China say wear your mask. Journalists in the US say no need and it might make it worse. *shugs in Mandarin*
Standard cloth face masks are a net risk - You breath out, moistening the cloth, then exterior contaminants breed on the damp surface A proper filtered respirator has a shuttle valve so the intake closes it pushing air through the filter, or is pushed open by exhaling directly
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The damp cloth breeds the virus and your exhalation spreads it - They are part of why China has such a track record with respiratory viruses The Filtered respirator needs changing daily and hazmat disposing - assuming it was a fine enough filter to catch viral particulate
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