Face Masks: Types & When to Use | Johns Hopkins Medicine
https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/coronavirus-face-masks-what-you-need-to-know
WebFace masks provide protection against transmission of respiratory viruses. Additional steps to help the spread of respiratory viruses include hand washing, respiratory etiquette, and avoiding others when you are sick. Lisa Maragakis, M.D., M.P.H., an expert in infection prevention, answers questions about face masks.
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