Observations on the symptomatology and diagnosis of clinical cases of Johne's disease.

Two clinical cases of Johne's disease are reported. There was a total absence of diarrhoea in one case despite a clinical course of the disease of more than 18 months. Typical gut lesions found on necropsy were confined to the small intestine. The diagnosis was confirmed on histopathological examination, and the finding of acid fast staining organisms and a retrospective complement fixation test on stored serum. The result of an intravenous avian tuberculin test conducted on the second case was inconclusive. This was attributed to the animal's temperament.