Detection of Staphylococcus aureus in bovine mastitis and some characteristics with special reference to enterotoxin producibility and coagulase types of isolates.

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Abstract
From Nov., 1979-Aug., 1980, 332 mastitic udders from cattle killed at the Tokyo Shibaura Slaughter House [Japan] were investigated for the presence of S. aureus. The isolates were tested for biochemical characteristics, enterotoxin production and coagulase types. S. aureus strains (87) were isolated from the udders. Of the 87 strains, 29 (33.3%) produced enterotoxins A, B or C; 24 (82.8%) produced enterotoxin C. All except 1 strain belonged to the coagulase types I-VIII. Types VI (34.5%) and V (20.7%) predominated among the 8 coagulase types. Of the 87 strains, 49 (56.3%) coagulated bovine plasma. Twenty-nine (33.3%) isolates produced fibrinolysin, 82 (94.3%) fermented mannitol, 40 (46.0%) were positive in the egg yolk reaction and all showed type A colonies when grown on blood agar containing 1:200,000 crystal violet. Some of the staphylococcal strains of bovine origin were negative for bovine plasma coagulation, but positive for fibrinolysin. Thus, S. aureus of bovine origin might be one of the causative agents of food poisoning.

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