The other blood that tested positive for the antibodies was collected Jan. 8, 2020 from Massachusetts, Feb. 3, 2020 from Wisconsin, Feb. 15, 2020 from Pennsylvania and March 6, 2020 in Mississippi – weeks prior to the first recognized cases in those states, the researchers found.
Blood sample testing supports theory COVID-19 was present in U.S. by Christmas Eve 2019
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