Masks reduce airborne transmission of SARS-CoV-2

Growing evidence suggests that SARS-CoV-2, the novel coronavirus that causes COVID-19, can be spread by asymptomatic people via aerosols — a reality that deeply underscores the ongoing importance of regular widespread testing, wearing masks and physical distancing to reduce the spread of the virus, say Kimberly Prather and colleagues in a new Perspective.

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