An estimated 168,000 people were infected by the coronavirus during the epidemic in the central Chinese city of Wuhan, with at least two-thirds of the infections asymptomatic, according to a national study of blood antibodies.“A large amount of asymptomatic carriers of Sars-CoV-2 [the virus that causes Covid-19] existed after elimination of clinical cases of Covid-19 in Wuhan. Therefore, [the virus] may exist in a population without clinical cases for a long period,” the researchers concluded…



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