| ORIGINAL ARTICLE |
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| Year : 2013 | Volume
: 5
| Issue : 11 | Page : 637-640 |
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Comparison of different phenotypic and genotypic methods for the detection of methicillin-resistant Staphylococcus aureus
Abbas Farahani1, Parviz Mohajeri2, Babak Gholamine3, Mansour Rezaei4, Hassan Abbasi3
1 Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
2 Department of Microbiology, Faculty of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
3 Department of Pharmacology and Toxicology, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran
4 Department of Biological Statistics, Faculty of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
Correspondence Address:
Parviz Mohajeri
Assistant Professor of Medical Bacteriology, Department of Microbiology, Kermanshah University of Medical Sciences, Shirudi shahid Blvd, Daneshgah St, Postal Code 67148-69914, Kermanshah
Iran
 Source of Support: Kermanshah University of Medical Sciences., Conflict of Interest: None  | Check |
DOI: 10.4103/1947-2714.122305
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Background: Staphylococcus aureus is known as a powerful pathogen that causes various infections. Emergence of methicillin-resistant S. aureus (MSRA) is responsible for nosocomial and community-acquired infections worldwide. Aims: The present study aimed to evaluate the performance and ability of eight different phenotypic and genotypic methods for the detection of MSRA. Materials and Methods: A total of 186 S. aureus isolates were defined as methicillin-susceptible S. aureus (MSSA; 95) and MSRA (91) using polymerase chain reaction (PCR) as the gold standard. Susceptibility to methicillin was investigated using oxacillin, methicillin, cefotetan, cefoxitin, and cefmetazole disks, by oxacillin Adata Tab and strips. For all S. aureus isolates minimal inhibitory concentrations of oxacillin were determined using the broth microdilution method according to Clinical and Laboratory Standards Institute guidelines. Results: Among the diagnostic methods studied, broth microdilution and the cefoxitin disk had the highest specificity (98.9 and 94.7%), sensitivity (100 and 98.9%), and concordance with PCR results (98.9 and 93.6%). The cefotetan and cefmetazole disks had the lowest concordance with PCR results. Conclusion: Our results suggest that microdilution and cefoxitin disk methods have high sensitivities compared with other methods for detection of MSRA. The cefoxitin disk method may be preferred in clinical laboratories because it is easy to perform and does not require special equipment. |
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