Surgeon General wearing a homemade face mask. [From: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover.html#studies]

CDC Recommends Masks to Limit Community Spread of COVID-19

Asymptomatic transmission causes CDC to change guidance on mask use.

Several scientific studies that track the spread of COVID-19 through groups of people show that spread by people with few or no symptoms is happening. This means that everyone needs to act as though they have the virus and can spread it to someone…

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Nancy R. Gough, PhD

Nancy R. Gough, PhD

Scientist, editor, and writer with a PhD in Pharmacology