Breaking: outcome of global pandemic increasingly uncertain, parts of WHO propaganda now siding with the Coronavirushttps://twitter.com/WHOWPRO/status/1243171683067777024 …
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So the best I've got on this is https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(20)30134-X/fulltext … which (a) agrees with you both on the carer setting but (b) notes the absence of evidence for broader usefulness [and (c) notes that absence of e ≠e of absence] Is this roughly the current state of knowledge?
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Meta study SARS and masks, UK https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5779801/ … Masks against influenza, medical personell https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5705692/ … https://www.sciencedirect.com/science/article/pii/S0091743514000322 … https://www.ncbi.nlm.nih.gov/pubmed/31479137 Masks against influenza, householdshttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2662657/ …
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Some Chinese companies now have interesting 'value adds': https://www.facebook.com/520033434715907/posts/3098134080239150/?d=n … (Btw, manufacturer of one of the most color accurate LEDs)
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