U.S. coronavirus transmission began in January, CDC analysis suggests

U.S. coronavirus transmission began in January, CDC analysis suggests

When did the coronavirus start spreading in the U.S.? Likely in January, CDC analysis suggests

By HELEN BRANSWELL

NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES/NIH

How early did local transmission of the SARS-CoV-2 virus begin in the United States? For the second time this week, scientists have proposed a new estimate.

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