Johne's disease usually enters a herd when healthy but infected animals are introduced to the herd. Herds that are not infected should take precautions against introduction of Johne's disease. Such precautions include keeping a closed herd, or requiring replacement animals come from test negative herds. In 1998, the United States Animal Health Association approved the Voluntary Johne's Disease Herd Status Program for Cattle (VJDHSP). The VJDHSP provides testing guidelines for States to use to identify cattle herds as low risk for Johne's disease infection. With numerous tests over several years, herds progress to higher status levels. The higher the status level, the more likely a herd is not infected with Johne's disease. In April of 2002, USDA-Animal and Plant Health Inspection Services-Veterinary Service incorporated portions of this program into its national program standards: Uniform Program Standards for the Voluntary Bovine Johne's Disease Control Program (VBJDCP). VBJDCP test negative herds (often referred to as Status Herds) serve as a source of low Johne's disease risk replacement animals. For more details on the VBJDCP, ( click here).
Some basic prevention strategies are:
Work with your veterinarian to develop a strategic plan for Johne's prevention and control for your farm. Consult with them about which Johne's test is best for your situation and use a test certified diagnostic laboratory.