[其他] CDC study: COVID-19 infected people in U.S. in mid-December 2019

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There were COVID-19 infections in the U.S. as early as mid-December 2019, weeks before it was first identified in China and a month earlier than the first case was reported in the U.S. on January 19, according to a new study by the country's Centers for Disease Control and Prevention (CDC). https://news.cgtn.com/news/2020- ... cFS1eec0/index.html