Western Canadian Animal Health Network Information Library

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Johne’s Disease Risk Factors

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Takeaways
• Older cows and skinnier cows or cows from herd having cows with signs of Johne’s disease, were more likely to test positive on an ELISA test.
• Herds having dairy cattle on-farm, or having cows showing signs of Johne’s disease on-farm were more likely to have a positive pooled PCR.
• Herds with a history of cows on-farm with clinical signs of Johne’s disease were more likely to test ELISA or PCR positive.

• These findings highlight the risks for producers in introducing animals from herds of unknown Johne’s status.