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Peter Ben Embarek, the lead investigator for the World Health Organization team looking into the origins of the Covid-19 outbreak, is seen at the Hubei Animal Disease Control and Prevention Center in Wuhan, China, on February 2. Hector Retamal/AFP/Getty Images

Investigators from the World Health Organization looking into the origins of coronavirus in China have discovered signs the outbreak was much wider in Wuhan in Dec. 2019 than previously thought. They are urgently seeking access to hundreds of thousands of blood samples from the city that China has so far not let them examine.

The lead investigator for the WHO mission, Peter Ben Embarek, told CNN in a wide-ranging interview that the mission had found several signs of the more wide-ranging 2019 spread, including establishing for the first time that there were over a dozen strains of the virus in Wuhan already in December.

The team also had a chance to speak to the first patient Chinese officials said had been infected, an office worker in his 40s with no travel history of note, reported infected on Dec. 8.

The slow emergence of more detailed data gathered on the WHO’s long-awaited trip into China may add to concerns voiced by other scientists studying the origins of the disease that the virus may have been spreading in China long before its first official emergence in mid-December.

Embarek, who has just returned to Switzerland from Wuhan, told CNN:

“The virus was circulating widely in Wuhan in December, which is a new finding.”

He explained that Chinese scientists presented his team with 174 cases of coronavirus in and around Wuhan in Dec. 2019. Of these, 100 had been confirmed by laboratory tests and another 74 through the clinical diagnosis of the patient’s symptoms.

Embarek said it was possible this larger number – of likely severe cases that had been noticed by Chinese doctors early on – meant the disease could have hit an estimated 1,000-plus people in Wuhan that December.

Embarek said the mission – which comprised 17 WHO scientists and 17 Chinese – had broadened the type of virus genetic material they examined from early coronavirus cases that first December. This allowed them to look at partial genetic samples, rather than just complete ones, he said. As a result, they were able to gather, for the first time, 13 different genetic sequences of the SARS-COV-2 virus from Dec. 2019. The sequences, if examined with wider patient data in China across 2019, could provide valuable clues about the geography and timing of the outbreak before December.

Embarek said: “Some of them are from the markets… Some of them are not linked to the markets,” which includes the Huanan seafood market in Wuhan, thought to have played a role in the virus’ first spread. “This is something we found as part of our mission… part of the interaction we had all together.”

 Read more of this CNN exclusive report here.

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