Previous studies of deer have suggested humans have repeatedly introduced the coronavirus into white-tailed deer populations in the United States and Canada and that deer can spread the virus to one another.
Whether the variants are still circulating in deer remains unknown. “That’s the big question,” said Dr Diego Diel, a virus expert at Cornell University and an author of the study, which was published last week in Proceedings of the National Academy of Sciences.
Scientists are not sure how people are passing the virus to deer, but they have speculated that it might happen when people feed deer or deer encounter human trash or waste. During the 2020 season, just 0.6% of the samples tested positive for the virus, a figure that rose to 21% during the 2021 season.
The scientists also compared the genomic sequences of the viral samples they detected in deer with those that had been collected from humans. In the deer, all three variants had new mutations that set them apart from the human sequences. But the alpha and gamma samples from deer diverged more significantly from the human sequences than the delta samples from deer did, researchers found.
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