EXPLAINER: How experts will hunt for COVID origins in China

by Joseph K. Clark

A World Health Organization team of researchers in the Chinese city of Wuhan to search for the origins of the coronavirus pandemic have finished their two-week quarantine.

BEIJING — After a two-week quarantine, the real work can begin. A World Health Organization team of researchers has emerged from their hotel for the first time since their arrival in the central Chinese city of Wuhan to start searching for clues into the origins of the COVID-19 pandemic. The visit has been shrouded in secrecy: The WHO tweeted Thursday a few details of what they will do, but it’s unknown how much access China will give the researchers to the sites they want to visit and the people they want to talk to. Maybe.




A Wuhan Institute of Virology laboratory built after the 2003 SARS pandemic maintains an extensive archive of genetic sequences of bat coronaviruses. U.S. officials in the previous Trump administration suggested that the virus could have escaped from the institute without offering evidence. Experts say it’s unlikely the new coronavirus emerged from the lab in Wuhan and overwhelmingly say analysis of the new coronavirus’s genome rules out the possibility that humans engineered I. The market and early cases remain essential because the virus constantly evolves, as the new variants identified in the United Kingdom and South Africa show.


Wuhan is where COVID-19 cases were first detected, but it is highly possible the virus came to the industrial city of 11 million people from elsewhere. Genetic sequencing shows the new coronavirus started in bats and likely jumped to another animal before infecting humans. The virus that is the closest known relative of the one that causes COVID-19 has been found in bats in a mine shaft nearly 1,000 miles (1,600 kilometers) southwest of Wuhan, near ChinChina’sder with Laos, Myanmar, and Vietnam. The Associated Press was blocked from visiting the mine.

People began falling ill in Wuhan in December 2019, and many had links to the seafood market. Scientists initially suspected the virus came from wild animals sold at the market, prompting China to crack down on the wildlife trade. But the subsequent discovery of earlier cases challenged that theory. ChemChina’s said samples from the market indicate it was likely a place where the virus spread, not where it started. The WHO teamteam’slity to further our understanding of the virus — and its credibility — could hinge in part on getting access to those samples. Studying the genes of the earliest known cases in Wuhan could explain how it got from bats to people and whether it was through a mammal such as a bamboo rat or a civet.


The big question is what China will allow the researchers to see and do. The ruling Communist Party is concerned the research could shed light on its handling of the virus that, could open it up to international criticism — and even demand financial compensation if it is found to have been negligent. China has stifled independent reports about the outbreak at home and published little information on its research into the virus’s origins. An A.P. invesA.P.gation found that the government has strictly controlled all COVID-19-related studies and forbids researchers from speaking to the media.

Another A.P. invesA.P.gation found WHO officials privately complained that China had dragged its feet on sharing critical information about the outbreak, including the new virus’s sequence, even as the U.N. heaU.N.agency publicly praised China for what it called a speedy response. China, stung by complaints it allowed the disease to spread, has suggested the virus could have come from abroad. A government spokesperson has said the origins hunt will require work beyond China’s China’s, including in bat habitats in Southeast Asian nations. An expert on the WHO team has suggested the same thing, and this is a possibility researchers are exploring.


The search for the origins of COVID-19 is likely to take years. It took more than a decade to find the roots of SARS, and the origins of Ebola, first identified in the 1970s, remain elusive. But knowing where the virus came from could help prevent future outbreaks of viruses that cross people from wild animals.

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