Shanghai — A team of experts appointed by the World Health Organisation completed its 28-day mission to the Chinese city of Wuhan this week seeking clues about the origins of Covid-19. The following looks at their findings.Peter Ben Embarek, the WHO’s leading animal disease expert, said the team conducted scientific investigations into four main scenarios about how SARS-CoV-2, the virus that causes Covid-19, spread into humans.
A third possibility is that Covid-19 originated under the first or second scenarios and was then transmitted via cold chain products. Chinese experts have attributed later Covid-19 clusters to imported frozen food and have raised the possibility it might also have caused the Wuhan outbreak. Marion Koopmans, another member of the expert team, said wildlife on sale in the Huanan seafood market could be traced to regions that contain bat habitats known to harbour viruses closely related to SARS-CoV-2. One such region is the southwestern Chinese province of Yunnan, but the team is also considering that the first human transmission took place across the border in Laos or Vietnam.
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