Johne's disease in sheep.

摘要: Summary The pathology of Johne's disease in the sheep as it occurs Scotland is given. On histological appearances has been divided into four groups. Group 1 characterised by masses epithelioid cells. pigmented variety M. Johnei most commonly present very large numbers. 2 a varying extent and distribution cell infiltration along with considerable leucocytic increase. number organisms seen smears are usually not nearly so numerous I. In sections, johnei larger areas cellular but smaller discrete foci. 3 foci multinucleate cells, giant cells Langhans type. may vary from dozen or to diffuse lamina propria. majority cases cannot be demonstrated except cultural examination. 4 lesions similar those described encapsulation, necrosis, caseation calcification present. can only limited even methods. evidence suggests that more virulent for than classical strain.