[其他] COVID-19 Possibly Arrived in the U.S. in Dec. 2019

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The SARS-CoV-2 virus, which causes COVID-19, may have arrived in the U.S. by December 2019, even before the first cases were reported in China, according to a new study published Monday in the journal Clinical Infectious Diseases.https://www.webmd.com/lung/news/ ... the-u-s-in-dec-2019