Chronic Wasting Disease Hits Farmed Deer in 3 Michigan Counties, Sparks Herd Tracing

Michigan agriculture officials have confirmed chronic wasting disease in farmed white-tailed deer across three counties, a discovery that is now triggering trace-back investigations to determine whether other privately owned herds have been exposed. The Michigan Department of Agriculture and Rural Development reported signs of the fatal neurological disease among deer in Calhoun and Kent counties, and a third infected animal was later discovered in Mackinac County while investigators traced the movement history of the Calhoun County herd.

According to CBS News Detroit, the cases involve a 2.5-year-old deer in Calhoun County, a 4-year-old deer in Kent County, and a 3-year-old deer in Mackinac County, with the Mackinac case identified specifically through trace-back work tied to the Calhoun facility, as reported by WZZM13. State officials said they are now following up on whether other farm herds have been exposed to the disease. Michigan allows deer, elk, reindeer and other cervid species to be raised on private land, but those operations must follow state guidelines for chronic wasting disease and bovine tuberculosis surveillance.

A Disease That Can Hide for Years

Chronic wasting disease is a fatal neurological illness that can spread from one animal to another, or indirectly through contamination in the environment. Symptoms include abnormal behavior, progressive weight loss and loss of body functions, but infected animals may appear healthy for months or even years before signs emerge, making early detection through testing critical.

“Regular surveillance testing is vital,” said Dr. Nora Wineland, who noted that early detection helps limit exposure of additional animals to the disease. Chronic wasting disease was first detected in Michigan's wild deer population in 2015, and the disease has since been found in at least 16 Michigan counties as of 2025. Since 2008, per the Michigan Department of Agriculture and Rural Development, chronic wasting disease has been confirmed at 16 privately owned cervid facilities statewide, including in Kent, Lake, Mecosta, Montcalm, Newaygo and Osceola counties. Hoodline previously reported on a similar case involving a 7-year-old farmed deer in Osceola in March 2025, which at the time marked the 16th Michigan deer farm to detect the disease since 2008.

Buffer Zones and Divided Oversight

Whenever chronic wasting disease is detected in a farmed or wild Michigan deer, state regulations trigger creation of a Special Surveillance Area, a buffer circle around the positive facility meant to restrict animal movement and increase monitoring, according to the state of Michigan. Oversight of the state's deer farms is split between two agencies: the Department of Natural Resources handles registration and facility inspections, while MDARD manages disease programs and pays the Michigan State University Veterinary Diagnostic Laboratory directly for CWD sample testing.

State officials said they have not received reports of human cases of chronic wasting disease. Still, the World Health Organization and the U.S. Centers for Disease Control and Prevention say animals infected with the disease should not be eaten by humans or domestic animals. As of January 2026, the disease has been documented in captive or free-ranging cervids across at least 36 U.S. states and five Canadian provinces, and the CDC has found that nearly 20% of U.S. residents hunt big game while more than 60% consume venison.

What's at Stake for Michigan's Hunting Economy

The financial and cultural weight of the issue is significant for Michigan, which supports more than 650,000 deer hunters who harvest an average of 430,000 deer annually. Big-game hunting contributes more than $2.3 billion to the state's economy each year, according to the City of East Lansing. Federal support exists for herd owners dealing with outbreaks: in June 2025, the USDA Animal and Plant Health Inspection Service allocated roughly $12 million nationally for CWD surveillance, management and herd depopulation indemnities, backing a voluntary certification program active in 28 states.

Hunters in affected areas also face specific legal requirements. Michigan regulations prohibit transporting intact deer carcasses out of CWD management areas unless the meat is fully deboned or delivered directly to a state-registered processor or licensed taxidermist, per the Michigan Department of Natural Resources. Wildlife watchers are encouraged to submit reports of sick or dead wildlife they encounter, since the disease can spread between animals directly or through environmental contamination that can persist for years.

Feeding Rules Still Carve Out Disease Zones

The discovery arrives just weeks after Michigan lawmakers relaxed the state's Lower Peninsula backyard deer feeding ban to allow limited food placement near residences. That July legislation, which Hoodline covered in its report on Whitmer's feeding ban changes, kept strict exceptions in place within CWD surveillance zones, reflecting concerns that artificial feeding sites concentrate animals and can accelerate prion transmission.

For now, state officials say the immediate priority is determining the full scope of exposure tied to the Calhoun, Kent and Mackinac facilities. Whether that leads to voluntary or mandatory depopulation of the affected herds, and whether trace-forward investigations turn up additional exposed operations, remains unresolved as the agriculture department continues its review.