Illinois Voluntary Johne's Certification Program
Johne's Disease Control on Illinois Dairy and Beef Cattle Operations

Transmission

M. paratuberculosis is spread primarily by oral consumption of contaminated feces. Clinical animals may excrete as many as 6,000,000 organisms per day in their feces.

Young calves are more susceptible than older animals. Calves from infected cows are more likely to become infected than those from non-infected cows. The disease can be transmitted across the placenta from cow to calf (20-40% of calves from cows with clinical signs are born infected). Johne's can be spread via the milk (and colostrum). Transmission via semen is possible, but unlikely.

Pastures may remain infected for approximately one year after contamination from animals shedding M. paratuberculosis.

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