Michigan authorities say a steer in Michigan's Thumb has tested positive for bovine tuberculosis and say it may be linked to another infection detected last year in Saginaw County.
The state Michigan Department of Agriculture and Rural Development announced Tuesday that lab tests on samples from a two-year-old Holstein steer from a Huron County feed lot had the illness.
The department says it tested cattle from the feed lot as "part of the trace investigation for the 2013 Saginaw County dairy herd." It says genetic tests may take eight weeks to determine if the infections are connected.
Bovine TB is endemic among Michigan deer. It can kill livestock and occasionally spreads to humans. Michigan has been testing cattle for bovine TB since 1995.
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