droplets and thereby lowering the dose of SARS-CoV-2 a person inhales, infections have much less chance of producing symptoms.
"If this theory bears out, population-wide masking, with any type of mask that increases acceptability and adherence, might contribute to increasing the proportion of There's some good evidence that masks could be working in this way, according to the two experts. They pointed out that animal studies conducted since the 1930s have borne out the notion of a"lethal dose," or how many viral particles are needed to cause severe disease.
For ethical reasons, similar trials in humans haven't been conducted. But population studies seem to support the"mask as vaccine" theory. For example, the U.S. Centers for Disease Control and Prevention reported that by mid-July about 40% of coronavirus infections were asymptomatic, but in areas of the United States where mask wearing was very prevalent, that number rose to 80%.
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