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
WEBJan 11, 2024 · Lisa Lockerd Maragakis, M.D., M.P.H. Updated on January 11, 2024. Face 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.
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