Apparently the Iowa deer are anti-vax
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https://www.webmd.com/lung/news/20211104/covid-widespread-among-iowa-deer
COVID Widespread Among Iowa Deer
THURSDAY, Nov. 4, 2021 (HealthDay News) -- The discovery that up to 80% of white-tailed deer in Iowa may be infected with COVID-19 has scientists worried that the animals could become a reservoir for variants that could come back to haunt humans.
In the new study, samples were collected lymph node samples from hundreds of dead deer across the state from April 2020 through January 2021. The researchers believe it's likely that the virus is rapidly spreading among the deer, The New York Times reported.
There's no evidence of deer-to-human infection, but the Penn State University authors and Iowa wildlife officials are warning deer hunters and others who have contact with deer to take precautions.
The veterinary microbiologists who led the study, which has not yet been published in a peer-reviewed journal, said they were shocked to find such widespread infection in deer.
"It was effectively showing up in all parts of the state," researcher Suresh Kuchipudi told the Times. "We were dumbfounded."
"There is no reason to believe that the same thing isn't happening in other states where deer are present," researcher Vivek Kapur said.