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STUDYING THE FREQUENCY OF METHICILLIN-RESISTANT STAPHYLOCOCCUS AUREUS THROUGH THE MOLECULAR DETECTION OF MECA

Authors: Rafeef Y. Rasheed رفيف يوسف رشيد --- Ahmed S. Abdulamir احمد صاحب عبد الامير --- Amir H. Raziq عامر هاني رزاق
Journal: IRAQI JOURNAL OF MEDICAL SCIENCES المجلة العراقية للعلوم الطبية ISSN: P16816579,E22244719 Year: 2014 Volume: 12 Issue: 3 Pages: 289-294
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Background:Methicillin-resistant Staphylococcus aureus is a major cause of serious nosocomial infections and it is very important to have a reliable test to detect these bacteria. mecA encodes the penicillin binding protein 2a, which is associated with staphylococcal methicillin resistance.Objective:The study was to determine the frequency of methicillin-resistant Staphylococcus aureus in different specimens from Iraqi patients and to genetically characterize and type the samples of methicillin- resistant Staphylococcus aureus through the detection of mec A gene.Methods:Sixty clinical isolates of Staphylococcus aureus were submitted to DNA extraction. Genomic DNA was submitted to conventional polymerase chain reaction assays, employing MR1-MR2 primers (primer set). The results were compared to the cefoxitin disks agar diffusion method.Results :Fifty seven of the sixty isolates showed positive results for mecA amplification while three isolates (5%) showed negative results for mecA gene.Conclusion:Good correlation between the mecA gene detection by PCR and the cefoxitin disk diffusion methods was obtained.Key words:mecA gene, Staphylococcus aureus, methicillin resistance Staphylococcus aureus

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