The head of a WHO-led team probing the origins of COVID-19 said that bats remain a likely source and that transmission of the virus via frozen food is a possibility that warrants further investigation, but he ruled out a laboratory leak.
Peter Ben Embarek, who led the team of independent experts on its nearly month-long visit to Wuhan, China, where the COVID-19 outbreak first emerged at a seafood market in late 2019, said that the team’s work had uncovered new information, but had not dramatically changed their picture of the outbreak.
“The possible path from whatever original animal species all the way through to the Huanan market could have taken a very long and convoluted path involving also movements across borders,” Embarek told a nearly three-hour media briefing.
Photo: AFP
Embarek said that work to identify the origins of COVID-19 points to a natural reservoir in bats, but it is unlikely that they were in Wuhan.
The investigators were also looking for Chinese blood samples that could indicate that the virus was circulating earlier than first thought, he said.
“In trying to understand the picture of December 2019, we embarked on a very detailed and profound search for other cases that may have been missed, cases earlier on in 2019,” he said.
“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,” he added.
The possibility that COVID-19 leaked from a laboratory — which has been the subject of conspiracy theories — was extremely unlikely and did not require further study, Embarek said.
Liang Wannian (梁萬年), a senior official at China’s National Health Commission who oversaw the nation’s COVID-19 response until September last year, said that there was evidence of infections that could have preceded the first detected case by “several weeks.”
“This suggests that we cannot rule out that it was circulating in other regions and the circulation was unreported,” he told the briefing.
The team had identified market vendors selling frozen animal products, including farmed wild animals, Embarek said.
“So there is the potential to continue to follow this lead, and further look at the supply chain and animals that were supplied to the market,” he said.
China has pushed the idea that the virus can be transmitted by frozen food and has repeatedly announced findings of traces of COVID-19 on imported food packaging.
“We know the virus can survive in conditions that are found in these cold, frozen environments, but we don’t really understand if the virus can transmit to humans” or under which conditions, Embarek told the briefing.
The team arrived in Wuhan on Jan. 14 and after two weeks of quarantine, visited key sites, including the Huanan seafood market, the location of the first known cluster of infections, as well as the Wuhan Institute of Virology, which has been involved in COVID-19 research.
Members of the team sought to rein in expectations for the mission, with infectious disease expert Dominic Dwyer saying that it would probably take years to fully understand the origins of COVID-19.
The US said that China needed to be more open when it comes to sharing data and samples as well as allowing access to patients, medical staff and lab workers. Beijing subsequently accused Washington of politicizing a scientific mission.
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