Direct prion transmission likely predominates during breeding season, but indirect interactions may be more common at socially attractive sites such as scrapes, the authors say.
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All cases were from the western part of the state, including 2 from previously unaffected hunting units 3B2 and 3B3, both in the western-central region.
West Virginia detected cases within 10 miles of the county border, triggering the addition, officials said.
The state DNR said that 89% of the positive cases were found in the Southern Farmland Zone.
The newly identified deer, a 4.5-year-old white-tailed buck, was harvested by a landowner helping the DNR with ongoing sampling.
Counties reporting their first CWD cases are Audrain, Callaway, Lewis, Marion, Miller, Morgan, and Texas, all of which abut CWD-positive areas.
The rest of the 23 CWD-positive deer harvested by hunters during the 2024-25 hunting season were found in Allen, Hardin, Marion, and Wyandot counties.
The newly affected counties, identified during the April 2024 to March 2025 CWD surveillance season, include Cedar, Davis, Shelby, Story, and Wapello.
The deer in Adams County, in west-central Illinois, is the first documented case outside of the state's northern CWD-endemic region.
CWD-positivity in hunter-harvested animals ranged from 2.3% in elk to 29% in white-tailed bucks.
The infected white-tailed deer was found in the Prince William County, Virginia, part of the park.
