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Unformatted text preview: Chronic, progressive enteric disease of ruminants o affects dairy and beef cattle, goats, sheep Caused by Mycobacterium avium ssp. Paratuberculosis o degeneration of the ileum of the small intestine Characteristics : Aerobic Heat resistant Sequesters inside white blood cells How common is it? found worldwide United States Beef cows (7.8%) Dairy Cows (22%) Manifestation : Primary infection route: oral-fecal o also ingestion of contaminated milk or colostrums Incubation period = 2 to 5 years Extensive granulomatous inflammation in the ileum Clinical Signs : Mimic intestinal parasite infection Diarrhea Weight loss with appetite Unthrifty Substantial drops in production Infertility or reproductive difficulties Shedding in feces can exceed 10 billion organisms/1g of feces Death Why is Johnes a concern for dairy farmers?...
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- Spring '08