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Background .  Staphylococcus aureus  ( S. aureus ) is one of the most common pathogens that cause hospital- and community-acquired infections in the world. The use of molecular typing methods is essential for determining the origin of the strains, their clonal relations, and also in epidemiological investigations. The purpose of this study was to determine the prevalence of antibiotic resistant  S. aureus  isolates and using spa, agr, and SCCmec typing to determine the dominant types in Iran.  Material and Method . Fifty isolates of  S. aureus  were collected from January to May 2010.  S. aureus  identification was performed by biochemical tests. Disk diffusion method was employed to assess the sensitivity of  S. aureus  strains to antibiotics and then genetic analysis of bacteria was performed using SCCmec, agr, and spa typing.  Results .  S. aureus  resistance to tetracycline, cefoxitin, clindamycin, ciprofloxacin, gentamicin, Cot: cotrimoxazole, levofloxacin, rifampin, and vancomycin were found to be 36%, 18%, 12%, 12%, 22%, 6%, 6%, and 0%, respectively. The results of this study showed that 16% of the isolates were resistant to methicillin (MRSA) and the majority of isolates were SSC mec type IV. In addition spa and agr typing revealed agr typeI and spa type t7688 to be the most predominant.  Conclusion . In this study, spa typing showed 100% reliability and the t7688 spa type had a frequency of 26% compared to the frequency of 0.0% in the Ridom SpaServer. The frequency of t304 spa type was higher than the global average.

Molecular Typing of Hospital-Acquired Staphylococcus aureus Isolated from Isfahan, Iran