Maria van Kerkhove, WHO technical lead on COVID-19, voiced hope that there would be further WHO-led international missions to China that would engage the country's cooperation.
She told a news conference that "more than three dozen recommended studies" must still to be carried out to determine how the virus crossed from the animal species to humans.
Reported Chinese testing for antibodies in Wuhan residents in 2019 will be "absolutely critical" to understanding the virus's origins, van Kerkhove said.
The WHO, in an editorial in the journal Science, said that detailed investigations of the earliest known and suspected cases in China prior to December 2019 were still needed, including analyses of stored blood
Chinese journalist who vanished for 600 days after exposing the Covid situation in Wuhan has turned up alive - and he's refusing to say where he went. Chen Qiushi took the last available train into Wuhan in January 2020, risking his life in a then Covid-riddled area to report on the outbreak and challenge the Chinese government.
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