The Michigan Department of Agriculture and Rural Development (MDARD) announced on Apr. 6 the detection of bovine tuberculosis in two cattle herds located in Alpena and Presque Isle counties. The department said the cases were identified during routine annual whole-herd surveillance testing.
The discovery highlights ongoing concerns about the spread of bovine tuberculosis, a bacterial disease that can affect all mammals, including humans. The disease is known to exist among wild white-tailed deer populations in certain parts of northeastern lower Michigan, which poses a risk for transmission to cattle.
State Veterinarian Nora Wineland said, “Both herds are located in areas where bovine TB is known to be present in the free-ranging white-tailed deer population, and both herds illustrate why it is so crucial to consistently perform surveillance testing and actively manage this disease.” Wineland added, “The most effective way to prevent bovine TB from infecting cattle herds is to protect cattle from contact with wild deer and the disease they could be carrying, which takes the collective efforts of hunters, producers, industry, and government agencies in Michigan.”
There are currently two designated zones for managing bovine TB within Michigan: a four-county Modified Accredited Zone consisting of Alcona, Alpena, Montmorency, and Oscoda counties; and an Accredited Free Zone that includes the rest of the state. While Presque Isle County falls within the Accredited Free Zone, it follows many requirements similar to those found in higher-risk areas regarding testing and movement controls for cattle.
An epidemiological investigation will take place to determine possible sources of infection. This will include genetic analysis of bacteria found during testing. MDARD stated that measures such as mandatory animal identification programs, required movement certificates for livestock transport, wildlife biosecurity initiatives, as well as continued deer hunting remain important tools for controlling further spread.
According to the official website, MDARD plays a role in preserving environmental resources supporting farming communities while overseeing a food and agriculture system valued at nearly $126 billion statewide. The department also focuses on fostering economic growth within food production sectors while protecting public health through enforcement actions related to animal welfare laws and commodity boards oversight.
For more information about bovine tuberculosis management or departmental responsibilities across Michigan’s agricultural landscape—including regulations related to weights and measures—visit MDARD’s website.
