WHO Investigators Say Covid-19 Likely Came From Animals, Not a Lab

A World Health Organization investigation in China found that the coronavirus most likely jumped to humans through an animal host or frozen wildlife products, finding that it’s “extremely unlikely” it came from a laboratory leak.

No further research is needed to look into the theory about a leak, Peter Ben Embarek, a WHO official, told reporters Tuesday at a joint briefing with China in Wuhan, the city where Covid-19 first mushroomed at the end of 2019. That speculation has been promulgated by former U.S. President Donald Trump and some others.

The virus could have been introduced to the Huanan wet market in Wuhan, which many of the first Covid patients were linked to, by a person who was infected or by a product that was sold there, Ben Embarek said.

“Among the more interesting products were frozen wildlife animals,” he said. “Some of these species are known to be susceptible to these kinds of viruses.”

The highly anticipated mission followed months of negotiation with a defensive China to facilitate and cooperate with the probe. Stung by criticism that it initially covered up the extent of the crisis, Chinese state media and officials have promoted the theory that the virus didn’t start in China, but was brought in. The WHO’s validation of a potential cold-chain transmission route is likely to bolster those efforts.

The team also examined tens of thousands of patient samples from Wuhan prior to the emergence of sick people in 2019. There was no evidence of significant outbreaks in the country before December 2019, WHO officials said.

“We embarked on a very detailed and profound search for other cases that may have been missed early on in 2019,” said Ben Embarek. “The conclusion was we did not find evidence of large outbreaks that could be related to cases of Covid-19 prior to December 2019 in Wuhan or elsewhere.”

The panel, comprising 17 Chinese and 17 international experts, looked for clues to understand how SARS-CoV-2 -- whose closest known relative came from bats 1,000 miles away -- spread explosively in Wuhan before causing the worst contagion in more than a century. Finding the source will inform efforts to stop the virus, and other pathogens with pandemic potential, spilling over into human populations.

Worldwide, Covid-19 has caused more than 106 million infections and 2.3 million deaths.

Mission delegates worked in three groups that focused on the epidemiology or spread of the disease, the potential involvement of animals and the environment, and the molecular evolution of the virus.

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