AFAIK this might be effective for some droplets and prevent infections. However, it doesn't deal with the issue of fomites, which are generally a much bigger issue than people coughing directly at you
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Replying to @TheSciBabe
Best evidence I believe for COVID19 is that the biggest risk is large droplets, which don't hang around for very long - that's why 1.5-2m is considered safer
3:57 PM - 26 Mar 2020
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