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What’s New with Chronic Wasting Disease?

In 2021, state wildlife managers will continue relying on hunters’ cooperation to assist with CWD surveillance in priority areas

By Tristan Scott
The National Bison Range near Moiese on August 10, 2014. Greg Lindstrom | Flathead Beacon

Montana Fish, Wildlife and Parks (FWP) is once again relying on hunters to be citizen-scientists during the fall harvest season to help collect data on chronic wasting disease (CWD). The department uses voluntarily submitted samples from hunters in order to inform management strategies for hunting districts where the disease is prevalent.

FWP states on its website that “hunting is the primary tool for monitoring and managing the spread of CWD,” and that “concerns over CWD shouldn’t stop you from enjoying the hunting season.” Hunter-harvest samples account for 94% of those tested by FWP, with road-kill samples accounting for 3%.

CWD is a neurological disease that affects deer, elk and moose. Infected animals may carry the disease for years without showing signs of illness, according to FWP, but it can lead to weight loss, lack of coordination and physical debilitation. If unmanaged, CWD has been known to vastly decrease local cervid populations.

In recent years, FWP significantly increased its surveillance testing for CWD, which was first detected in wild populations in Montana in 2017, and in captive game farms in 1999. Utilizing voluntary sampling by hunters, FWP wildlife officials have tested 18,854 animal species since 2017, with 456 positive samples as of Sept. 13. The species sampled included 123 positive detections in mule deer, 327 positive detections in white-tailed deer, one elk, and two moose (these were Montana’s first detections in moose and wild elk.

The department continues to focus on several high-priority sampling areas, including the Hi-Line, the Philipsburg area, southeastern Montana and the Libby area.

The state’s effort to curb CWD in Northwest Montana gained urgency in 2017, when a white-tailed doe in the Libby area marked the first time the disease had been detected west of the Continental Divide in Montana. In response, FWP set up a priority surveillance area surrounding Libby and detected 60 positive cases in the area, almost exclusively in white-tailed deer.

Within the town of Libby itself, CWD was prevalent in 13.3% of white-tailed deer, one of the highest concentrations in the state. Wildlife researchers believe the high positivity rate is likely due to the lack of harvesting within city limits, which allows deer to age and interact at a higher level, spreading the disease.

A report released on the study indicated that the disease has likely been present in the area for a decade, and has been “aggravated by high white-tailed deer densities sharing localized food sources, like birdfeeders, fruit trees and the town dump.”

For the 2021 season, FWP is not setting up management zones or restricting transportation of harvested animals, but will still be conducting surveillance in “priority areas” in Northwest Montana, as well as three other designated regions of the state. Certain areas of the state are designated as Priority Surveillance Areas where FWP is making a concerted effort to gather more samples. In those specific areas, hunters are asked to voluntarily submit a sample from their animal.

If hunters want their harvested animal sampled, they can submit samples themselves by following steps on the Montana CWD Submission Guide or by visiting a CWD Sampling Station. For instructions on how or where to submit a sample, visit

In 2021, a carcass may be moved within the state regardless of where it was harvested as long as the carcass parts are disposed of in a landfill after butchering and processing. Carcass parts, such as brain, eyes, spleen, lymph glands, and spinal cord material, should be bagged and disposed of in a landfill or may be left at the kill site. Dumping carcasses is illegal, unethical and can spread diseases, including chronic wasting disease. This new requirement applies to all deer, elk, and moose carcasses wherever in the state they are harvested by hunters or as vehicle-killed salvage. Protect our herds: properly dispose of carcasses.

In order to further limit the spread of CWD, the Montana Fish and Wildlife Commission recently adopted regulations on which scents and lures hunters can use. Hunters should also report any sick-looking deer, elk or moose to their local FWP offices as soon as possible.

CWD is caused by a mis-folded prion protein in cervid populations, and infected animals are contagious for about two years before dying. Since the disease was initially discovered in 1967, it has been found in 26 states, three provinces and four other countries around the world.

There is no known instance of CWD transmission to humans, and no evidence that humans can develop neurological issues related to the disease. Even so, FWP advises that hunters wear gloves when processing animals. Hunters should skin and gut their kills quickly, cool them quickly and cook any harvested meet well before consumption.

The Centers for Disease Control and Prevention (CDC) recommends that all animals harvested in an area where CWD is known to be present be tested. The CDC also advises against eating the meat of any animal that tests positive. FWP requires that carcasses are properly disposed of, which means all parts must be bagged and disposed of in a landfill or left at the kill site.

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