White-tailed deer have become a reservoir for COVID-19. Now, researchers think a deer in Canada may have infected a human
A white-tailed deer in Canada likely infected a human with coronavirus, according to new research. The case, reported in a
Together, those factors suggest that the virus had been circulating among deer and accumulated mutations as it hopped from one animal to the next, before ultimately being passed to a person. It’s possible the virus was transmitted first through another host species, such as a mink, though the genomic analysis suggests that direct transmission from deer to human is “the most likely scenario,” the authors write.
, a veterinarian and director of the Center on Emerging and Zoonotic Infectious Diseases at Kansas State University, who was not involved with the work. For the research, scientists took nose and tissue samples from 300 dead white-tailed deer in southwestern and eastern Ontario between November and December 2021. All the animals had been killed by hunters and were already being tested as part of an annual surveillance program for chronic wasting disease, which kills deer and their relatives.
That’s good news, says Richt, who agrees that deer-to-human infection appears to be the most likely explanation for the human case in Ontario. It remains unknown if there are other human cases of the Ontario deer-related virus or if there have been other spillover events from deer to people, the Canadian team emphasizes.
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