Frequency and Antimicrobial Resistance Patterns of Methicillin-Resistant Staphylococcus aureus in Tehran
Message:
Abstract:
Background
Methicillin-Resistant Staphylococcus aureus (MRSA) is the one of most commonly isolated organisms from clinical samples which can cause life-threatening infections. The emergence and spread of antibiotic resistance makes the treatment of these infections more complicated. In this study, we aimed to determine the patterns of antibiotic resistance among MRSA isolates from Tehran, Iran.
Methods
From December 2012 to April 2014, 120 clinical samples were collected. MRSA was identified by cefoxitin disc diffusion. Antimicrobial susceptibility testing was performed on MRSA isolates for eight other antibiotics by disc diffusion method according to CLSI (2013) recommendations. Also, the minimum inhibitory concentration (MIC) was determined for vancomycin by MIC test strips.
Results
According to disc diffusion, 60 (50%) isolates showed resistance to cefoxitin. Among these isolates, the rate of resistance to nitrofurantoin, vancomycin, teicoplanin, doxycycline, trimethoprim, erythromycin, clindamycin, and ciprofloxacin were 0%, 0%, 0%, 28.3%, 28.3%, 58.3%, 63.3%, and 70%, respectively. All isolates were susceptible to vancomycin according to disc diffusion and MIC.
Conclusion
Compared to other reports from Iran, our study indicated a moderate rate for MRSA. However, the rates of resistance to generally prescribed antibiotics in these isolates were high. In this situation, it is recommended to monitor the antibiotic resistance in these hospitals.
Language:
English
Published:
Journal of Medical Bacteriology, Volume:2 Issue: 3, 2013
Page:
41
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