(BUSINESS INSIDER) The science is clear: Face masks can prevent coronavirus transmission and save lives.
A preliminary analysis of 194 countries found that places where masks weren't recommended saw a 55% weekly increase in coronavirus deaths per capita after their first case was reported, compared with 7% in countries with cultures or guidelines supporting mask-wearing. A model from the University of Washington predicted that the US could prevent at least 45,000 coronavirus deaths by November if 95% of the population were to wear face masks in public.
But not all masks confer equal levels of protection.
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