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並前往https://health.ucsd.edu/news/releases/Pages/2021-03-18-novel-coronavirus-circulated-undetected-months-before-first-covid-19-cases-in-wuhan-china.aspx

Novel Coronavirus Circulated Undetected Months before First ...

... likely circulated undetected for two months before the first human cases of COVID-19 were described in Wuhan, China in late-December 2019.

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