Serovars and biovars of Pasteurella haemolytica isolated from calves.

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Abstract
The serovar and biovar distribution of P. haemolytica isolated from calves in Japan was studied. A total of 113 isolates of P. haemolytica were examined. Eighty-five isolates from the lung lesions of 36 pneumonic calves were determined as serovar 1; 1 isolate from the apparently normal lung of a healthy calf was serovar 2. The remaining 27 isolates belonged to Frank''s new serovars 13-15 except 5 untypeable strains; 1 isolate belonged to serovar 13, 4 to serovar 14 and 17 to serovar 15. Serovars 13 (1 isolate), 14 (4) and 15 (1) were all from pneumonic tissues. Isolates of serovar 15 (16) were from eye swabs of calves. All 113 isolates were considered to correspond to biovar A from such biochemical characteristics as production of catalase and .beta.-galactosidase, and the fermentation pattern of D-trehalose, D-xylose and D-mannose. The different biochemical characteristics between established serovars 1 and 2 and new serovars 13, 14 and 15 were also discussed.

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