[其他] Study Suggests Covid-19 Was In The U.S. Weeks Earlier Than Thought

TOPLINE Researchers, including scientists from the Centers for Disease Control and Prevention (CDC) and the American Red Cross, have found evidence that Covid-19 was present in the U.S. in December 2019, weeks earlier than previously thought and before even the first cases in Wuhan, China, had been publicly identified. https://www.forbes.com/sites/rob ... na/?sh=60a8750c4bf8
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