Distribution of erm genes among Staphylococcus aureus isolates with inducible resistance to clindamycin in Isfahan, Iran.

Ghanbari, F. and Ghajavand, H. and Havaei, R. and Jami, M.S. and Khademi, F. and Heydari, L. and Shahin, M. and Havaei, S.A. (2016) Distribution of erm genes among Staphylococcus aureus isolates with inducible resistance to clindamycin in Isfahan, Iran. Advanced biomedical research, 5. p. 62. ISSN 2277-9175

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Abstract

BACKGROUND The rising frequency of methicillin resistant Staphylococcus aureus (MRSA) has led to an increased use of antibiotics such as macrolide, lincosamide, streptogramin B (MLSB) for the treatment of S. aureus infections. Resistance to MLSB in S. aureus is commonly encoded by erm genes, which can be constitutive MLSB (cMLSB) or inducible MLSB (iMLSB). The purpose of this study was to determine the frequency of cMLSB, iMLSB, and MS phenotypes using D-test and polymerase chain reaction (PCR) methods. MATERIALS AND METHODS A total of 215 isolates of S. aureus were collected from January 2010 to May 2012 from Al-Zahra Hospital in Isfahan. PCR was performed for detection of mecA gene on all isolates using specific primers. The frequency of MLSB-resistant isolates was determined using D-test, and then a multiplex PCR was performed for detection of ermA, ermB, and ermC genes. RESULTS Among 215 S. aureus isolates examined, 82 (40.9%) were MRSA, and iMLSB, cMLSB, and MS resistance phenotypes had a frequency of 9 (4.18%), 58 (26.9%), and 11 (5.1%), respectively. Among nine isolates with iMLSB resistance phenotype, four isolates contained ermC gene, two isolates ermB gene, and one isolate ermA gene. Two isolates did not have any erm gene. CONCLUSION In the current study, cMLSB was the most frequent phenotype and ermC was the most common gene in iMLSB resistant phenotypes.

Item Type: Article
Uncontrolled Keywords: Clindamycin; D-test; Staphylococcus aureus; erm genes; inducible resistance
Subjects: WC Communicable Diseases
QU Biochemistry
Divisions: Reserach Vice-Chancellar Department > Cellular and Molecular Research Center
Depositing User: zahra bagheri .
Date Deposited: 17 Jul 2017 09:56
Last Modified: 17 Jul 2017 09:56
URI: http://eprints.skums.ac.ir/id/eprint/1445

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