Why is COVID surging this summer? A doctor explains what to know and how to stay safe.
CBSN
It's not just President Biden who recently tested positive for COVID — cases of the virus are spiking across the country.
Nearly 40 states are reporting high COVID activity levels, according to data from the Centers for Disease Control and Prevention, and emergency room visits are at their highest for the virus since February.
Why the seemingly sudden summer surge? There are a couple of factors at play, Dr. Céline Gounder, CBS News medical contributor and editor-at-large for public health at KFF Health News, told "CBS Mornings" Wednesday.
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