All seven known human coronaviruses have origins in bats, mice or domestic animals, scientists say.
Yuan also rejected theories that the lab had accidentally released a coronavirus it had harvested from bats for research purposes, saying the lab's biosecurity procedures were strictly enforced.
Though the new coronavirus was first identified in Wuhan, conspiracy theories circulating within China have suggested the virus did not originate there. Yuan did not comment directly on the claims, but said there were "still no answers" about the virus's origins. He cited a paper by British and German scientists published this month suggesting that the SARS-CoV-2 variant circulating in the United States was a more "primitive" version of the one in China, and might have appeared there first.
China has been accused of underestimating its total number of cases and trying to cover up the origins of the disease, which the government rejects.
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