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

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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