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The most abundant DNA was from raccoon dogs, and some was detected in a nearby garbage cart that also tested positive for the virus.

The animal which came up most frequently in the samples was the common raccoon dog.

The presence of the coronavirus in samples from the market containing genetic material linked to raccoon dogs, they have said, is consistent with that scenario.

A virus in civets and raccoon dogs sold in marketplaces in southern China matched the one that sickened humans, and a virus later found in bats looked like its ancestor.

Two spillovers into people, from a market stall holding infected raccoon dogs, was more parsimonious than two separately infected laboratory workers, carrying their infections independently to the same market.