Pathology of naturally occurring paratuberculosis in Gaddi goats of Himachal Pradesh
2017
In present study, pathological changes due to paratuberculosis, also known as Johne's disease, were described in apparently healthy Gaddi goats in Himachal Pradesh. Tissue including terminal ileum, ileo-caecal junction and associated lymph nodes were collected from 68 goats slaughtered for table purpose, and screened for lesions of paratuberculosis by performing Ziehl-Neelsen's (ZN) staining and gross/histopathological examination. Eighteen out of 68 goats showed gross lesions of paratuberculosis. Microscopic examination of affected tissues revealed lesions in 39 goats. The microscopic lesions were classified into four grades i.e., grade I (least severe) to IV (most severe) on the basis of infiltration of mononuclear cells consisting of lymphocytes, macrophages and epithelioid cells. Out of 39 goats, 9 (23.07%), 17 (43.58%), 9 (23.07%) and 4 (10.25%) showed lesions of grade I, II, III and IV, respectively. In addition, ZN staining of smears and/or tissue sections revealed acid fast bacilli (AFB) in 5 out of 17 grade II, 8 out of 9 grade III animals and all the 4 grade IV cases whereas, none of the grade I case was positive on ZN staining. Results of the study indicated that diagnosis of caprine paratuberculosis could be done on the basis of gross, microscopic lesions in the intestine and associated lymph nodes and demonstration of AFB in the affected tissues and smears using ZN staining. The present study puts on record the first report of paratuberculosis among Gaddi goats in HP.
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