[其他] Covid-19 Likely in U.S. in Mid-December 2019, CDC Scientists Report

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The new coronavirus infected people in the U.S. in mid-December 2019, a few weeks before it was officially identified in China and about a month earlier than public health authorities found the first U.S. case, according to a government study published Monday. https://www.wsj.com/articles/cov ... -report-11606782449