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In total, 111 isolates of Pasteurella multocida that were recovered from various avian species, pigs, cattle, and deer in Taiwan since 1970 were investigated. All 111 isolates were shown to be belonged to Carter's capsular serotyping type A. The results ofHeddleston's somatic serotyping indicated that 80.2 % (89/111) of the isolates were of serotype 1, 14.4 % (16/111) were of serotype 3, 4.5 % (5/111) were of serotype 8, and 0.9 % (1/111) was serotype 9. According to animal species, one isolate of bovine orgin was of3 , A serotype : one isolate from deer was of 1 , A serotype : 14 isolates of swine origin were of 1 : A (2 isolates) : 3 : A (8 isolates), and 8: A (4 isolates) serotypes : 95 isolates from various avian species ( chickens, ducks, geese, turkeys, pigeons) were of 1 , A ( 86 isolates, 90.5 % ), 3 : A ( 7 isolates, 7.4 % ), 8: A ( one isolate, duck origin ) and 9 : A ( one isolate, duck origin ) serotypes, of 84 isolates tested for their biochemical characteristics, all had uniform biochemical properties. All 84 isolates tested completely fermented galactose, glucose, mannose and mannitol. However, they showed varied fermentation reactions to other carbohydrates. The fractions of the isolates that fermented various carbohydrates were as follows , sucrose, 96.4 % : arabinose, 88.1 % : sorbitol, 33.3 % ; Maltose, 2.4 %.
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