Coronavirus Spread Widely in Deer, and Perhaps Back to People, U.S.D.A. Says

Health Information Lifestyle

There is no evidence that deer play a major role in spreading the virus to humans, but the transmission of the virus from people to animals raises several public health concerns.

First, animal reservoir could allow viral variants that have disappeared from human populations to persist. Indeed, the new study confirms prior reports that some coronavirus variants, including Alpha and Gamma, continued to circulate in deer even after they became rare in people.

New animal hosts also give the virus new opportunities to mutate and evolve, potentially giving rise to new variants that could infect people. If these variants are different enough from those that have previously circulated in humans, they could evade some of the immune system’s defenses.

Researchers at the Animal and Plant Health Inspection Service, in collaboration with other government and academic scientists, began looking for the coronavirus in free-ranging white-tailed deer in 2021, after studies suggested that the animals were susceptible to the virus.

In that first year of surveillance work, the scientists ultimately collected more than 11,000 samples from deer in 26 states and Washington, D.C. Nearly a third of the animals had antibodies to the coronavirus, suggesting that they had previously been exposed, and 12 percent were actively infected, APHIS said on Tuesday.

For the new Nature Communications paper, scientists from APHIS, the Centers for Disease Control and Prevention and the University of Missouri sequenced nearly 400 of the samples collected between November 2021 and April 2022. They found multiple versions of the virus in deer, including the Alpha, Gamma, Delta and Omicron variants.

Then, the scientists compared the viral samples isolated from deer with those from human patients and mapped the evolutionary relationships between them. They concluded that the virus moved from humans to deer at least 109 times and that deer-to-deer transmission often followed.

The virus also showed signs of adapting to deer, and the researchers identified several cases in North Carolina and Massachusetts in which humans were infected with these “deer-adapted” versions of the virus.


APHIS has expanded its surveillance to additional states and species.

Many questions remain, including precisely how people are passing the virus to deer, and the role that the animals might play in sustaining the virus in the wild., GO TO SAUBIO DIGITAL FOR MORE ANSWERS AND INFORMATION ON ANY TOPIC

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