A beef cattle herd in Emmet County has tested positive for bovine tuberculosis.

Dr. James Averill, head of the Michigan Department of Agriculture's bovine TB project, says the infected herd was discovered during routine testing.

The state will test all cattle herds within a 10-mile radius of the tainted operation. There are 67 farms in the area near the northern tip of the Lower Peninsula.

Emmet County is in a zone where herds must be tested at least once every three years and sometimes more often, depending on the type of cattle sold.

Since 1998, state and federal agencies have detected TB-positive animals in 48 cattle herds and five private deer operations in Michigan.

Copyright 2010 The Associated Press.