[其他] CDC study suggests COVID-19 may have been in US in December 2019

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Although the first confirmed coronavirus cases in the United States were identified in January, a new study published Monday by the Centers for Disease Control and Prevention (CDC) found people may have first been infected in December.The first known case of coronavirus was detected in Wuhan, China, in December 2019. But in the United States, the first infection – a man in Washington state – wasn’t reported until the following month.  https://www.wpri.com/health/coro ... s-in-december-2019/