New research suggests face masks may act as a crude vaccine of sorts. The theory -- and it remains largely a theory -- is that by filtering out airborne coronavirus droplets and thereby lowering the dose of SARS-CoV-2 a person inhales, infections have much less chance of producing symptoms.
from WebMD Health https://www.webmd.com/lung/news/20200909/could-your-mask-be-a-kind-of-vaccine-against-covid-19?src=RSS_PUBLIC
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