[其他] COVID-19 was likely in US as early as December 2019, study suggests

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The government study, published Monday in the journal Clinical Infectious Diseases, analyzed blood donations from the American Red Cross from Dec. 13, 2019 to Jan. 17, 2020. Researchers found 106 of the 7,389 samples collected contained antibodies that suggested a person had a previous COVID-19 infection.   https://www.abc10.com/article/ne ... b-a25b-cefd52308a13