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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Wildlife organization calls for culling of herds, increased testing, and a dedicated funding mechanism.
The deer also had epizootic hemorrhagic disease, a fatal viral illness that affects primarily white-tailed deer.
While a road-killed deer or other cervid may be a safety hazard for motorists, CWD experts view it as a potential reservoir of deadly and extremely resilient prions.
After two initial positive tests, the confirmation test was negative, but officials said they are treating the case as CWD.
The white-tailed deer was harvested in the Kootenay region in October near where a CWD-positive doe was killed in a vehicle collision in February 2024.
Elk Hunt Area 23 shares borders three other hunt areas that have reported cases of the fatal neurodegenerative disease.
Louisiana's case is the first in Jefferson Davis Parish, and the Washington case is its second and is near the first.
The cases include two deer in Conway and Stone counties in Arkansas and an elk in Montana's Hunting District 704.
The case was detected last week in Marshall County, a North Mississippi CWD management zone.
The newly affected regions are Deer Hunt Areas 31 and 94 and Elk Hunt Area 126.