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I am the second

Some Americans had the coronavirus in December 2019

The National Institutes of Health said Tuesday morning that testing of samples from an ongoing study of Americans show a very limited number of cases of SARS-CoV-2 infection in five U.S. states as early as Jan. 7, 2020.

Why it matters: Calling it another "piece of the puzzle" of when and how the coronavirus pandemic began, the NIH researchers say this offers more evidence that the virus was in the U.S. at the end of December.

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