Surgical masks are made up of several layers of nonwoven plastic and can effectively filter very small particles, such as droplets of SARS-CoV-2 (the virus that causes COVID-19). The masks typically ...
The more contagious COVID variant first found in the U.K. is now doubling in prevalence roughly every 10 days in the U.S. At the current pace of vaccination, some people won’t get shots until the end ...
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