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The origins of SARS-CoV-2

The first cases of COVID-19, the disease caused by the SARS-CoV-2 virus, were reported in December, 2019 in the city of Wuhan, in the Hubei province of China. It is therefore reasonable to assume that the disease originated in or around Wuhan.
41 cases of COVID-19 were reported to local health authorities in Wuhan, during December 16, 2019 to January, 2020. The clinical features of these patients were reported in this study in the journal Lancet, in February, 2020:

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