Paper Information

Journal:   IRANIAN JOURNAL OF MICROBIOLOGY   JUNE 2016 , Volume 8 , Number 3; Page(s) 161 To 167.
 
Paper: 

FREQUENCY OF GENES ENCODING ERYTHROMYCIN RIBOSOMAL METHYLASES AMONG STAPHYLOCOCCUS AUREUS CLINICAL ISOLATES WITH DIFFERENT D-PHENOTYPES IN TEHRAN, IRAN

 
 
Author(s):  HOSSEINI SAREH SADAT, NIAKAN MOHAMMAD, SADERI HORIEH, MOTALLEBI MITRA, TAHERIKALANI MOROVAT, ASADOLLAHI KHAIROLLAH, EMANEINI MOHAMMAD*
 
* DEPARTMENT OF MICROBIOLOGY, SCHOOL OF MEDICINE, TEHRAN UNIVERSITY OF MEDICAL SCIENCES, NO. 100, POURSINA ST., KESHAVARZ BLVD., TEHRAN, IRAN
 
Abstract: 

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.

 
Keyword(s): STAPHYLOCOCCUS AUREUS, D-TEST, ERM A, ERMC, MSRA
 
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