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Face mask effectiveness: What we know now

How scientists test face mask effectiveness against coronavirus

This is why we should all wear a mask to prevent the spread of #COVID-19 Article: Respiratory virus shedding in exhaled breath and efficacy of face masks "We identified seasonal human coronaviruses, influenza viruses and rhinoviruses in exhaled breath and coughs of children and adults with acute respiratory illness. Surgical face masks significantly reduced detection of influenza virus RNA in respiratory droplets and coronavirus RNA in aerosols, with a trend toward reduced detection of coronavir