Introduction: Bovine mastitis is one of the main problem affecting dairy herds in terms of costs. Among the causative agents of mammary infections, S. aureus remains of the more frequently isolated microorganism. It is usually associated with a subclinical infection and is one of the most difficult to treat with antibiotics in veterinary medicine. The objective of this study was to investigate the antibiotic sensitivity of S.aureus isolated in Kerman dairy farms.
Methods: A total 18 S.aureus strains isolated from bovine clinical and subclinical mastitis in Kerman dairy farms. The phenotypic and antibiogram patterns of these strains were investigated.
Results: the majority of the isolates were non haemolytic (72.2%). Most isolates were resistant to oxytetracycline (94.4%) and penicillin (77.7%). All isolates were susceptible to erythromycine and trimethoperim-sulphamethoxazole.
Conclusion: The most of strain isolated from bovine mastitis were resistance to routine antibiotic like penicillin, ampicillin and oxytetracycline and … so is necessary to antibiogram before treatment.