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==Description==

==Description==

Johne's Disease is a contagious and chronic disease of ruminants caused by the bacteria ''[[Mycobacterium avium subsp. paratuberculosis]]''. Affected species include cattle, sheep, goats and camelids. The disease is present worldwide with the highest prevalence occurring in dairy cattle. In these animals the disease is responsbile for severe economic losses due to reduced reproductive performance, increased susceptibility to disease, reduced milk production and culling losses.

Johne's Disease is a contagious and chronic disease of ruminants caused by the bacterium ''[[Mycobacterium avium subsp. paratuberculosis]]''. Affected species include cattle, sheep, goats and camelids. The disease is present worldwide with the highest prevalence occurring in dairy cattle. In these animals the disease is responsbile for severe economic losses due to reduced reproductive performance, increased susceptibility to disease, reduced milk production and culling losses.

==Pathogenesis==

==Pathogenesis==