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2024年5月16日 · What Are Face Masks? Face masks prevent disease droplets you cough, sneeze, or breathe from infecting others. They also help keep people who have COVID-19 or other illnesses from infecting you. As...
2023年12月19日 · There are several ways this can happen: Droplets or aerosols. This is the most common transmission. When an infected person coughs, sneezes, or talks, droplets or tiny particles called aerosols...