Where did Covid-19 originate? These virus sleuths are assessing every theory

The origins of Covid-19 remain unknown, and a gamut of hypotheses, conspiracy theories and studies have raised more questions than answers about how the virus that causes the disease emerged and spread around the world.Now, a group of battle-tested disease detectives, led by an American scientist with a history researching bat viruses in China, are stepping up to evaluate “every hypothesis” for the source of this virus, first identified in the Chinese city of Wuhan nearly a year ago.The task…

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