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Showing 2 results for Meca Gene
Volume 12, Issue 3 (9-2009)
Abstract
Objectives: Staphylococcus aureus is an important cause of serious infection in both hospital and the community. Methicillin-resistant S. aureus (MRSA) is associated with high morbidity and mortality rates with rapid development of resistance. There is a need for early and reliable detection of MRSA infection to direct antibiotic therapy, and more effectively control cross-infection. In this study, resistance to methicillin was detected by a disk diffusion method, the determination of MIC, and the PCR for mecA gene.
Materials and Methods: A total of 174 S.aureus strains were isolated from different clinical specimens from three teaching Hospitals. Antibiotic susceptibility was determined by disk diffusion method, MIC for oxacillin was made by the agar dilution, and mecA gene was identified by specific primers.
Results: The prevalence of MRSA by three methods ranged from 47% to 50%, and mecA positive isolates were more resistant to all of the antibiotic tested than mecA negative isolates. All S. aureus isolates were resistant to penicillin, and susceptible to vancomycin. The results of agar dilution test indicated a low-level resistance to methicillin (MIC>64mg/l). The distribution of MRSA isolates were uniform between three hospitals, and there were not significant differences in the presence of MRSA between isolates from different clinical specimens.
Conclusion: The PCR method was the best test for routine detection of MRSA in the present study. An additional benefit of the mecA PCR is the potential to generate a susceptibility report, 24h earlier than the time of generation of results of conventional susceptibility testing methods.
Zahraa Neamah Abbas, Hanaa Naji Abdullah, Bijan Ranjbar,
Volume 15, Issue 2 (5-2024)
Abstract
In this study, 50 Staphylococcus aureus samples from Baghdad Hospital were collected and examined, 17 samples were infected with methicillin-resistant Staphylococcus aureus (MRSA) and 5 samples were infected with vancomycin-resistant Staphylococcus aureus (VRSA). The sensitivity of the isolates against different antimicrobial agents was evaluated using the VITEK2 standard system. According to CLSI, the minimum inhibitory concentration (MIC) values of zinc oxide quantum dots (ZnO-QDs) were also tested by the Muller-Hinton dilution method. In addition, polymerase chain reaction (PCR) was performed to identify vanA and mecA genes. The antibacterial effects of ZnO-QDs on VRSA were higher than MRSA isolates.