Now #coronavirus has been officially confirmed that it transmits through air 
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Not sure if it’s useless, there is at minimum a clear reduction in face touching that may intercept a primary vector. Reducing infectivity is good.
It unfortunately only protects from large droplets, smaller airborne aerosole droplets can only be protected by an N95 Mask/respirator.
I just mean, it is not complete useless, there is a modest personal protection effect and a large herd immunity effect. Nonetheless N95 or P100 masks much better but supplies are more than 100x smaller than needed
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