Pass home sheep home 2 walk through6/6/2023 ![]() ![]() dairy herds have at least one cow that tests positive for Johne’s with herd prevalence approaching 100% in large dairy herds. Johne’s disease is found worldwide.īased on the 2007 Dairy NAHMS study, about 68 percent of U.S. paratuberculosis), a hardy bacterium related to the agents of leprosy and TB. Johne’s disease is caused by Mycobacterium avium subspecies paratuberculosis (M. ![]() Johne’s disease is a contagious, chronic, and usually fatal infection that affects primarily the small intestine of ruminants.
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