The highly transmissible omicron variant is sweeping through the U.S., causing a huge spike in COVID-19 cases and overwhelming many hospital systems. Besides urging Americans to get vaccinated and ...
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Wearing a mask is one way to reduce the spread of COVID-19. There are many types, including surgical masks, cloth masks, and respirators. SARS-CoV-2, the virus that causes COVID-19, usually transmits ...
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