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frequency of genes encoding erythromycin ribosomal methylases among staphylococcus aureus clinical isolates with different d-phenotypes in tehran, iran
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نویسنده
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sadat hosseini sareh ,niakan mohammad ,saderi horieh ,motallebi mitra ,taherikalani morovat ,asadollahi khairollah ,emaneini mohammad
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منبع
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iranian journal of microbiology - 2016 - دوره : 8 - شماره : 3 - صفحه:161 -167
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چکیده
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background and objectives: macrolide, lincosamide and streptogramin type b (mlsb) antibiotics are important in the treatment of staphylococcus aureus infections and existence of isolates with ability to resist against mlsb antibiotics is worrisome. materials and methods: in this cross sectional study, 101 s. aureus isolates were collected from patients of five selected hospitals in tehran over a period of five months. disk diffusion tests and differentiation between constitutive and inducible resistances were carried out by d-test. the presence of meca, msra, erma and ermc genes were detected using pcr or multiplex pcr. results: out of 101 s. aureus isolates, 58 (57.4%) were methicillin resistant and 57 (56.4%) expressed resistance to erythromycin. the prevalence of constitutive mlsb (cmlsb), inducible mlsb (imlsb) and ms (negative) phenotype in all erythromycin resistant isolates were 71.9, 26.3 and 1.7%, respectively. out of all the erythromycin resistant isolates, 57.8% harbored both erma and ermc genes which possessed constitutive resistance. 8.7% of the isolates contained erma gene alone which possessed inducible resistance with d phenotype and 5.2% of isolates just contained ermc gene which had inducible resistance with d+ phenotype. msra gene was detected in 3.5% of the erythromycin resistant s. aureus isolates with constitutive resistance. none of the genes were detected among ms phenotypes. conclusion: in this study, most of s. aureus isolates carried both erma and ermc genes and there was a significant relationship (p value ≤ 0.05) between different resistance phenotypes and erm genes. keywords: staphylococcus aureus, d-test, erm a, ermc, msra
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کلیدواژه
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staphylococcus aureus ,d-test ,erm a ,ermc ,msra
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آدرس
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shahed university, ایران, shahed university, ایران, shahed university, ایران, department of microbiology, school of medicine, tehran university of medical sciences, tehran, iran, Iran, Islamic Republic of, razi herbal medicines research center & department of microbiology, school of medicine, lorestan university of medical sciences, ilam, iran, Iran, Islamic Republic of, department of social medicine, school of medicine, ilam university of medical sciences, ilam, iran, Iran, Islamic Republic of, department of microbiology, school of medicine, tehran university of medical sciences, tehran, iran, Iran, Islamic Republic of
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پست الکترونیکی
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emaneini@tums.ac.ir
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Authors
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