Minnesota DNR: 2020 CWD sample results shows low prevalence of disease in areas tested

Another post to keep readers updated on Chronic Wasting Disease in Minnesota's wild deer herd. 

The Minnesota Department of Natural Resources sent out this press release on Monday:

2020 CWD testing shows low prevalence of disease in areas tested

Season’s chronic wasting disease detections were within two disease management zones

Testing results from Minnesota’s 2020 hunting season and early 2021 special hunts confirmed chronic wasting disease in 22 wild deer, all within current disease management zones, according to the Minnesota Department of Natural Resources.

In total, 7,682 samples were tested from hunter-harvested deer or opportunistic samples (deer killed by vehicles, reported sick or found dead). Nineteen of the positives were from deer in the southeast management zone and three were from the south metro management zone.

CWD was not detected in the north-central disease management zone, the southeast control zone, or the surveillance areas put in place for the 2020 hunting season. The surveillance areas added in 2020 were in east-central and west-central Minnesota, as well as a south metro surveillance area that surrounds the south metro management zone.

“Though CWD is detected in Minnesota’s wild deer, our recent test results show that the disease prevalence remains relatively low,” said Erik Hildebrand, DNR wildlife health specialist. “Keeping deer healthy is our priority, and we continue to take aggressive action in areas where the disease has been detected in wild deer and monitor for the disease in areas where there are elevated risks for CWD.”

Some test results from the year’s management activities and any deer reported sick or dead are still pending; results will be updated on the DNR’s CWD webpage as they become available.

The DNR monitors CWD by testing wild deer. When the disease is detected in either captive or wild deer, the DNR establishes surveillance areas and tests wild deer for at least three years after the detection. This is because it can take 1 ½ to 3 years before a deer shows clinical symptoms. If three consecutive years of test results fail to confirm CWD, and an adequate number of deer are sampled, the DNR will end surveillance in an area. Details are in the DNR’s CWD response plan.

In fall 2020, the DNR shifted to voluntary self-service sampling to facilitate social-distancing measures at sampling stations during the COVID-19 pandemic. With the shift, the DNR set sampling goals that would allow the agency to confidently assess disease prevalence in an area. While the majority of areas received enough samples to meet sampling goals, some surveillance areas did not.

The DNR will continue sampling for disease in these areas to enhance confidence about disease detection.

“We appreciate all those who participated in sampling this year. Each deer tested gives valuable information that contributes to our understanding of the disease’s prevalence and geographic distribution in our herd,” Hildebrand said.

Current management actions
Where CWD has been detected in wild deer, the DNR uses a three-pronged approach to limit the spread of the disease and keep Minnesota’s wild deer population healthy: reducing deer densities, restricting deer feeding and attractants, and limiting deer carcass movement.

This year, in areas where CWD-positive deer were detected, the DNR held two special hunts after the firearms hunting season and also provided landowners within a 3-mile radius of positive deer with shooting permits to further reduce deer densities.

From February through March, the DNR will work with the U.S. Department of Agriculture-Wildlife Services to complete targeted culling in focused areas where CWD has been detected in wild deer. Venison from these deer that do not test positive for CWD will be donated through the Share the Harvest program. More information about the program is available on the DNR website.

Final CWD test results will influence how the DNR manages the disease going forward and determines the 2021 hunting regulations, which will be released in August.

Additional CWD information
Keeping Minnesota’s wild deer population healthy remains the goal of the DNR’s response to chronic wasting disease. Since CWD was first detected in Minnesota in 2002, the DNR has tested more than 90,000 wild deer in the state. To date, 110 wild deer have tested positive for CWD in Minnesota. CWD test results, including locations of confirmed positive test results and statistics, are available on the DNR website at mndnr.gov/cwdcheck.

As part of its CWD response plan, the DNR monitors and manages for CWD in disease management zones around areas where the disease has been detected in wild deer. The CWD management zones are located in the southeast, north-central and south metro areas of Minnesota. The DNR monitors for the disease in surveillance areas where CWD has been found in captive deer farms or which are adjacent to other areas of known risk located in the east-central, west-central and south metro areas of Minnesota.

CWD is always fatal and affects the deer family, which includes deer, elk and moose. There is no vaccine or treatment for this disease.

For more information on chronic wasting disease, including maps of CWD surveillance areas, frequently asked questions and hunter information, visit mndnr.gov/cwd.

Related posts:

• Ecklund's HF219 passed out of MN House Environment committee on bipartisan 14-5 vote
• Press release: DNR continues CWD response with southeast MN, south metro special hunts
• Hunted and roadkill wild deer in Dakota and Olmsted Counties test positive for CWD
• Some of the science at the center of Update on Chronic Wasting Disease Efforts hearing
• Board of Animal Health: Chronic wasting disease confirmed in Houston County farmed deer herd 
• MN DNR: Deer hunters urged to submit samples in chronic wasting disease sampling areas
• Capital Report & Session Daily updates on MN Chronic Wasting Disease research and policy
• MN DNR reminds deer hunters of significant changes to regulations related to CWD
• Session Daily: Experts want to study how CWD flows in state's waterways
• CWD news digest: #Mnleg agenda; Wisconsin confirms 105 recent CWD cases in captive deer
• Douglas County deer farm investigation leads to discovery of Pine County captive doe CWD case
• MNDNR: extensive sampling of wild deer in 2019 shows CWD remains biggest concern in SEMN
• News item: Fillmore County Board gets CWD update; approves refugee resettlement
• Meanwhile in South Dakota: Game, Fish & Parks (GFP) Commission modifies rules related to CWD
• Just in from the MN DNR: Wild deer in Dakota County confirmed positive for CWD
• Meanwhile in MN: four more Chronic Wasting Disease positive deer on Pine County farm
• Capital Report & Session Daily updates on MN Chronic Wasting Disease research and policy

Photo: White-tailed deer in the woods.

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