Johne's Disease Resources   

Johne’s disease is a contagious, chronic, and usually fatal infection that affects primarily the small intestine of ruminants. Johne’s disease is caused by Mycobacterium avium subspecies paratuberculosis (M. avium subsp. paratuberculosis), a hardy bacterium related to the agents of leprosy and TB. Johne’s disease is found worldwide.

USDA information on Johne's Disease (USDA)