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Bovine Tuberculosis

Bovine tuberculosis (TB) is one of the oldest diseases known to man, and it is caused by the bacteria Mycobacterium bovis. While the disease is found primarily in cattle, it has also been found in cervids (deer and elk), bison, goats, and carnivores such as coyotes. In fact, any warm-blooded animal, including humans, can be affected by the disease. For information on bovine TB in wildlife, visit the Department of Natural Resources' website.

In Michigan, bovine TB is not a new issue. The disease was frequently found in dairy and beef cattle throughout the mid-20th Century. Today, the disease 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.

As a result, there are currently two TB zones within the state: a four-county area in northern lower Michigan called the Modified Accredited Zone (MAZ) and the remainder of the state is referred to as the Accredited Free Zone (AFZ).

Map of Michigan Bovine Tuberculosis Zones

Michigan Bovine TB Zones

Eradicating Bovine TB

The goal of Michigan’s Bovine Tuberculosis (TB) Program is to work together with its One Health partners to prevent, control, and ultimately eradicate the disease in cattle.

With more than 12,000 cattle producers in the state who maintain more than 1.2 million cattle, the program plays a crucial role in maintaining market access for Michigan cattle, meat, and milk products.

In the MAZ and its adjacent counties, the TB Program works daily on disease surveillance, animal traceability, and prevention of bovine TB transmission from deer-to-cattle.


For Cattle Producers:

For Veterinarians:

Deer Management: 

Regulatory Items:

Press Releases

Contact Information

Michigan Department of Agriculture & Rural Development

Animal Industry Division
Constitution Hall, 6th Floor
PO Box 30017
Lansing, MI 48909

Atlanta Regional Office
16860 M-32
PO Box 758
Atlanta, MI 49709