アメリカでは去年から感染者がいたんだ! Covid-19 Likely in U.S. in Mid-December 2019, CDC Scientists ReportThe 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 authorit…www.wsj.com 2019年12月、中国武漢でCOVID?19を原因とするSARS?CoV?2ウイルスが初めて発見され、全世界に広がった。米国での最初の症例は2020年1月に発見された。
Covid-19 Likely in U.S. in Mid-December 2019, CDC Scientists ReportThe 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 authorit…www.wsj.com