Reason that past clinical studies, focusing on health-care worker outcomes, are not the best indicator is that masks for *source-control* is not an individual level variable. It's like asking if filters on car exhausts lower air pollution by measuring the air ... inside each car.
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The issue here is potentially *infected* person infecting others. So incorrect wear is really not very relevant because the person is already infected. As for outside of mask getting infected? Well, obviously better to have whatever on the outside of mask than on your face!
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Healthcare worker studies were all about correct versus incorrect wear, and unsurprisingly, incorrect wear is less protective for oneself, especially around aerosolizing procedures etc. But here, we're discussing protecting *others* from the wearer. Very neglected area tbh.
End of conversation
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