If you google masks, you will stumble into dozens of news articles telling you that they are useless and you should not buy them. Is this a coordinated campaign to increase the probability that medical responders can stock up at Walmart, or just journalists copying each other?
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It shows that wearing a mask by infected persons protects others. I don't see this study proving that the wearer of a mask is protected. But it may be true that the lack of evidence is due to a lack of research in this area.
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https://www.ncbi.nlm.nih.gov/pubmed/19193267 This controlled study compared parents wearing masks while looking after children with flu to parents that did not wear masks.
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