Almost a year and a half since the discovery of the virus that causes covid-19, The Economist’s health policy editor, Natasha Loder, investigates one of the pandemic’s most compelling mysteries: where did SARS-CoV-2 come from? Peter Daszak, who was part of the World Health Organisation’s controversial fact-finding mission to China, explains what evidence they gathered from Wuhan’s animal markets and the city’s microbiology laboratories. 

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