Chronic wasting disease sample comes back suspect

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A whitetail buck feeds in Glacier National Park.

A chronic wasting disease sample collected by Montana Fish, Wildlife and Parks in late October from a hunter-killed deer was found to be suspect for the disease.

The sample was collected from a mule deer buck harvested in hunting district 510 south of Billings. The animal was killed in an area with a mixture of private and public land 10 miles southeast of Bridger. A second sample collected from the animal is being sent to the lab at Colorado State University for further testing, with results expected next week. If the result is positive, it will mark the first time the disease has appeared in wild deer, elk or moose in Montana.

FWP has notified the hunter who submitted the suspect sample and landowners in the area where the deer was harvested. Though typically it takes one sample test to determine whether an animal is positive, that wasn’t the case here. Though the sample is considered suspect at this point, it is very rare that a suspect sample isn’t ultimately found positive. Therefore, wildlife officials are moving forward as if the deer will ultimately be determined positive.

“We’ve suspected it wasn’t a matter of if, but when CWD would show up in Montana,” said Ken McDonald, FWP wildlife division administrator. “Fortunately, we’ve done a lot of work to prepare for this, and are hopeful the prevalence will be low as we work toward managing the disease.”

FWP has recently updated its response plan for the disease, which was presented to the Fish and Wildlife Commission on Tuesday and is now open for public comment.

In accordance with the response plan, FWP director Martha Williams assembled an incident command team to respond to the detection. The incident command team will define an initial response area (IRA) around where the infected animal was harvested, and may recommend a special hunt. The specifics of this hunt would be determined by the incident command team.

The goal of a special hunt would be to collect enough samples to determine disease prevalence and distribution. The disease can only be effectively detected in samples from dead animals. FWP would rely on hunters to harvest enough animals to make these determinations.

Chronic wasting disease is a progressive, fatal disease affecting the central nervous system of mule deer, white-tailed deer, elk and moose. It is part of a group of diseases called Transmissible Spongiform Encephalopathies (TSEs). TSEs are caused by infectious, mis-folded prion proteins, which cause normal prion proteins throughout a healthy animal’s body to mis-fold, resulting in organ damage and eventual death.

CWD is a slow-moving disease. However, left unmanaged, it could result in long-term population declines within affected herds.

All the states and provinces that border Montana, other than Idaho and British Columbia, have found the disease in their wild cervids. The closest positive to Montana was in Wyoming, about 8 miles south of the Montana border and less than 50 miles southeast of where Montana’s suspect deer was harvested.

Though there is no evidence the disease is transmissible to humans, it is recommended to never ingest meat from animals that appear to be sick or are known to be positive. The Centers for Disease Control and Prevention recommends hunters who have harvested a deer, elk, or moose from a known infected area have the animal tested prior to consuming it. If hunters harvest an animal that appears to be sick, the best thing to do is contact FWP and have the animal inspected.

Some simple precautions should be taken when field dressing deer, elk or moose:

• Wear rubber gloves and eye protection when field dressing.

• Minimize the handling of brain and spinal tissues.

• Wash hands and instruments thoroughly after field dressing is completed.

• Avoid consuming brain, spinal cord, eyes, spleen, tonsils and lymph nodes of harvested animals. (Normal field dressing coupled with boning out of a carcass will essentially remove all of these parts.)

FWP is currently in year one of a revamped CWD surveillance program. Department staff are collecting CWD samples from hunters in this year’s priority area of south central Montana. Most samples are collected from game check stations and cooperating meat processors and taxidermists. Hunters who submit a sample will receive a card with a sample number. That number can be checked online along with the list of results at

Should this suspect sample be determined to be positive, FWP will move quickly to communicate with local landowners, government agencies and the public about plans for a special hunt. The success of any CWD hunt will depend largely on the cooperation from everyone involved.

In the meantime, FWP will be encouraging all hunters harvesting deer within that area (hunting districts 502 and 510) to get them sampled. This can be done by visiting the Laurel check station, which is open on weekends, or by contacting or visiting the FWP regional office in Billings at 406-247-2940.

For more information and to look at test results, go online to

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