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==Gross Pathology==

==Gross Pathology==

Lesions are usually localised to the terminal portion of the ileum.  The mucosal surface is diffusely thickened with transverse, corrugated rugae which do not disappear when the intestinal wall is stretched. In sheep and goats however, nodule formation with necrosis and calcification may be seen.

Lesions are usually localised to the terminal portion of the ileum.  The mucosal surface is diffusely thickened with transverse, corrugated rugae which do not disappear when the intestinal wall is stretched. In sheep and goats however, the lesions usually described are nodule formation with necrosis and calcification .

Infected animals may also have enlarged mesenteric lymph nodes.

Infected animals may also have enlarged mesenteric lymph nodes.