Scientists parse another clue to possible origins of Covid-19 as WHO says all possibilities 'remain on the table'
A new analysis of genetic material collected at the Huanan Seafood Market in Wuhan, China -- shown here in 2020 -- uncovered animal DNA in samples already known to be positive for SARS-CoV-2.
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There's a tantalizing new clue in the hunt for the origins of the Covid-19 pandemic.