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Scientists parse another clue to possible origins of Covid-19 as WHO says all possibilities 'remain on the table'

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There's a tantalizing new clue in the hunt for the origins of the Covid-19 pandemic.

A new analysis of genetic material collected from January to March 2020 at the Huanan Seafood Market in Wuhan, China, has uncovered animal DNA in samples already known to be positive for SARS-CoV-2, the coronavirus that causes Covid-19. A significant amount of that DNA appears to belong to animals known as raccoon dogs, which were known to be traded at the market, according to officials with the World Health Organization, who addressed the new evidence in a news briefing on Friday.