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How well do face masks protect against COVID-19?
The virus that causes COVID-19 spreads mainly through the air when a person coughs, sneezes, sings, talks or breathes. Virus particles can drift in the air and be inhaled, especially in crowded places ...
Early in the pandemic, mask-wearing policies were consistently associated with decreased transmission of SARS-CoV-2. At that time, the masks worn were generally made of cloth and often improvised. The ...
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