I receive a number of questions about bovine leukosis or bovine leukemia virus (BLV) every year. This disease has implications for trade with Canada and other countries and can cause minimal to moderate health problems in infected herds. The virus is very common in U.S. herds, and many herds have from a few to most of the cows infected with the virus. The virus does not cause disease in humans and is not associated with leukosis or leukemia in people.
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