In utero transmission may contribute to the efficient spread of the fatal infection among deer populations, the study authors say.
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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.
A hunter harvested the elk next to the lower Ruby Valley, which has a high prevalence of the fatal prion disease in white-tailed and mule deer.
The state has activated its interagency CWD response plan to investigate the detection and increase surveillance of wild deer in the area.
Officials said wildlife biologists euthanized a buck with CWD symptoms at the Flathead County Landfill after receiving reports on the animal.
The case is also only the second such detection in the state after CWD was found in a wild deer in Ballard County in 2023.
The service prioritized jurisdictions that have detected CWD or that border CWD-endemic areas and have either launched surveillance programs or plan to do so.
