An outbreak of Tyzzer's disease occurred in a colony of wild-caught muskrats. Deaths occurred suddenly and gross lesions were limited to focal liver lesions, and hemorrhages and necrosis in the cecum and colon. Bacilli typical of Bacillus piliformis were demonstrated in liver and intestinal lesions. Subsequently, Tyzzer's disease was diagnosed in two other muskrats from the same river.
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1 April 1971
TYZZER'S DISEASE IN MUSKRATS
LARS KARSTAD,
PETER LUSIS,
DAVID WRIGHT