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?
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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This is also a limited setting, so the mask is useful. The question was whether the mask helps healthy people who use it all day in everyday situations such as on the street, at work and at home to avoid infection during a pandemic. There seems to be no evidence for this.
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By the way: If everyone wears a mask, then every infected person protects others from infection. The only problem is, we don't have enough masks for that.
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