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Johne's Disease (Paratuberculosis) in Goats: A Report of Eight Cases in Quebec.

Johne's disease (paratuberculosis) is reported in eight goats. Clinical signs were mainly those of a chronic wasting disease which lead to emaciation, severe weakness, prostration and death. Soft pasty stool and/or profuse diarrhea were observed only after several weeks of illness, in the terminal stages of the disease, in six of the eight goats. Gross lesions were characterized by emaciation and mesenteric lymphadenopathy with more or less extensive areas of caseous necrosis and calcification. Gross lesions in the intestinal tract were limited to a mild thickening and corrugation of the mucosa of the distal small intestine, cecum and proximal parts of the colon in three of the affected animals. Caseous necrosis of Peyer's patches and ulceration were observed in two goats when small tuberculoid nodules were present in the liver of another one. Histologically, the intestinal lesions were characterized by accumulations of large foamy or vacuolated macrophages in the intestinal mucosa. Lesions were usually mild and multifocal in the proximal and middle parts of the small intestine, more diffuse and severe in the distal jejunum, ileum and proximal parts of the colon. Several of the macrophages infiltrated in the intestinal mucosa and mesenteric lymph nodes were packed with acid fast bacilli. Observations made on these animals stress the importance of a careful histological examination of the intestines and mesenteric lymph nodes of adult goats submitted to necropsy because of a chronic wasting disease.