Cattle in Alpena County in northeast Michigan are currently quarantined after a dairy herd in the area tested positive for Bovine TB.

The infected cows were found during a routine surveillance test conducted by the Michigan Department of Agriculture and Rural Development (MDARD) and the U.S. Department of Agriculture (USDA) to move the state entire state back to TB-free status.

UpNorthLive.com reports Northeastern Lower Michigan is designated as a Modified Accredited Zone (MAZ) and is comprised of Alcona, Alpena, Montmorency, and Oscoda counties.

Bovine TB is an infectious bacterial disease affecting cattle and white-tailed deer. In addition to surveillance testing, farmers use tools to prevent deer from infecting their herds.