混合生乳에서 coagulase陽性 saphylococcus aureus의 分布 및 特性

Incidence and characterization of coagulase-positive staphylococcus aureus in bulk milk from dairy farms

In order to know the incidence of coagulase-positive in bulk milk from dairy farms, attempts were made to isolate the organism from 207 samples. Also examined was biochemical characteristics and antimicrobial susceptibility of the isolates. Isolation rates of coagulase-positive Staphylococcus aureus in bulk milk samples were 24.6%, The population of Staphylococcus aureus varied from 10¹ to 10⁴/ml. All the isolated of the staphylococcus aureus showed production of coagulase, TNase and DNase, and fermentation of mannitol. However, of 133 isolates, 121(91.0%) showed hemolysis on sheep blood agar and 97.7% produced lecithinase in egg yolk medium. All of 133 isolates were sensitive to cephalothin, chloramphenicol and vancomycin but 33.1~46.6% of the strains were resistant to kanamycin, tetracycline and gentamicin.