In the previous hunting season, three parks near Gettysburg National Military Park reported their first cases.
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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.
The test may be useful in CWD surveillance, the authors say.
The dogs were able to identify infected deer through feces samples.