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MDARD Announces Detection of Bovine Tuberculosis-Positive Herd in Charlevoix County
February 20, 2026
LANSING, Mich.—The Michigan Department of Agriculture and Rural Development (MDARD) is reporting a case of bovine tuberculosis (TB) in a dairy herd from Charlevoix County, located west of Michigan’s Modified Accredited Zone (MAZ) —an area where the disease is known to be present in the white-tailed deer population. Following a bovine TB detection in an adult cow identified at a United States Department of Agriculture Food Safety Inspection Service-inspected processing plant, the animal was traced back to its herd of origin. The herd was subsequently tested, and additional bovine TB cases were found.
“This latest detection of bovine TB highlights two important realities: how challenging the disease is to address; and why it is so crucial to use all of our tools for detection to swiftly identify cases and take actions to limit disease spread,” said State Veterinarian Nora Wineland, DVM, MS, DACVPM. “While finding a newly affected herd is never ideal, this case demonstrates our systems for detection and traceability are working, allowing us to quickly implement measures to protect animal health and public health in Michigan.”
Bovine TB is a bacterial disease that can affect all mammals, including humans. It is known to be present in the free-ranging white-tailed deer population in specific areas of northeastern lower Michigan, and the disease can be transmitted between deer and cattle.
An epidemiological investigation is already underway to rule out the possibility of additional cases stemming from this affected herd.
While MDARD and other state and federal agencies are taking significant steps to manage bovine TB within the MAZ through routine surveillance testing of cattle herds, mandatory animal identification, required movement certificates, and wildlife biosecurity programs, deer hunting in the northeastern Lower Peninsula continues to be an important tool in combatting this disease and maintaining healthy deer, healthy cattle, and healthy people.
More information about bovine TB can be found on MDARD’s website.
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