(Abstracted from Lancet 2020;395:689–697) Wuhan, China, has been investigating the outbreak of the 2019 novel coronavirus (2019-nCoV, COVID-19), now called severe acute respiratory syndrome coronavirus 2 (SARS-CoV2), since December 31, 2019. At the end of January 2020, nearly 6000 cases of infections by SARS-CoV2 have been confirmed in mainland China, and 78 cases had been identified as having been exported from Wuhan to areas outside mainland China.
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Wu et al. (2020) studied this question.