SAN FRANCISCO -- As fears rise over China's coronavirus outbreak spreading to the United States, more and more people are looking for ways to protect themselves. One of the most in-demand items are ...
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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 ...
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