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MDARD Announces Detection of Bovine Tuberculosis-Positive Herd in Alcona County

LANSING, Mich.—The Michigan Department of Agriculture and Rural Development (MDARD) is reporting a case of bovine tuberculosis (TB) in a cattle herd from Alcona County, part of Michigan's Modified Accredited Zone (MAZ). The herd was identified as part of the routine annual whole herd surveillance testing that occurs in the MAZ.

"Bovine TB is a persistent, complex disease, which is why routine surveillance testing remains an essential disease management tool. Every test helps us to determine where bovine TB is and to improve our understanding of how it might be shifting across Michigan's landscape, improving our capacity to respond to this disease,"  said State Veterinarian Nora Wineland, DVM, MS, DACVPM. "MDARD along with agency partners, producers, and stakeholders continue to be steadfast in our commitment to protect animal and public health throughout the state."

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. There are currently two TB zones within the state: a four-county area (Alcona, Alpena, Montmorency, and Oscoda counties) known as the MAZ and the remainder of the state is referred to as the Accredited Free Zone.

An epidemiological investigation is underway to identify any potential additional cases stemming from this newly identified affected herd. Whole genome sequencing will also occur to help determine the source of the infection.

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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