Over half the deer in Michigan seem to have been exposed to SARS-CoV-2

Image of a young deer.

Enlarge / Plague-bearing Bambi? (credit: Cheryl E Davis / Getty Images)

On Wednesday, the US Department of Agriculture released some rather disturbing news: a survey of wild deer populations has found that large numbers of them seem to have been exposed to SARS-CoV-2, the virus that causes COVID-19. The finding indicates that there’s a very large population of wild animals in North America that could serve as a reservoir for the virus even if we were to ever get its circulation within the human population under control.

Probably not an error

Why check deer in the first place? It turns out that the USDA’s Animal and Plant Health Inspection Service is studying a variety of species “to identify species that may serve as reservoirs or hosts for the virus, as well as understand the origin of the virus, and predict its impacts on wildlife and the risks of cross-species transmission.” This is the same group that identified the spread of the virus to a wild mink in 2020.

Using a captive deer population, the USDA had already determined that deer can be infected by the virus, although the animals display no symptoms. So, although direct interactions among deer and humans are relatively limited, check the wild populations made sense. The USDA checked populations in a total of 32 counties in four different states, obtaining blood samples to look for antibodies specific to SARS-CoV-2.

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