BBC: coronavirus may exist in the US several weeks before the first case was officiallyidentified

原标题：BBC: coronavirus may exist in the US several weeks before the first case was officiallyidentified

A new study by scientists from US CDC recently published on the medical journal Clinical Infectious Diseases shows that the virus may exist in the US several weeks before the first case was identified in the country, BBC (www.bbc.com/zhongwen/simp) reported on Dec. 10, 2020.

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