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Vol. 14. Issue 1.
Pages 11-14 (January - February 2010)
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Vol. 14. Issue 1.
Pages 11-14 (January - February 2010)
Original article
Open Access
Prevalence of phenotypic resistance of Staphylococcus aureus isolates to macrolide, lincosamide, streptogramin B, ketolid and linezolid antibiotics in Turkey
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Riza Adaleti1, Yasar Nakipoglu2,
Corresponding author
yasarnakip@yahoo.com

Correspondence to: Department of Microbiology and Clinical Microbiology Istanbul Faculty of Medicine Istanbul University 34390 Capa Istanbul, Turkey. Tel: +90 212 414 20 00-32372, Fax: +90 212 414 20 37.
, Nurgul Ceran3, Cihan Tasdemir1, Fatma Kaya1, Semiha Tasdemir1
1 Clinical Microbiology Laboratory, Haydarpasa Numune Education and Research Hospital, Istanbul, Turkey
2 Istanbul University, Istanbul Faculty of Medicine, Department of Microbiology and Clinical Microbiology, 34390 Capa, Istanbul, Turkey
3 Clinical Microbiology and infectious disease, Haydarpasa Numune Education and Research Hospital, Istanbul, Turkey
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Abstract

The incidence of drug-resistant pathogens differs greatly between countries according to differences in the usage of antibiotics. The purpose of this study was to investigate the phenotypic resistance of 321 methicillin resistance Staphylococcus aureus (MRSA) and 195 methicillin susceptible S. aureus (MSSA) in a total of 516 S. aureus strains to macrolide, lincosamide, streptogramin B (MLSB), ketolid, and linezolid. Disk diffusion method was applied to determine MLSB phenotype and susceptibility to different antibiotic agents. It was found that 54.6% of the isolates were resistant to erythromycin (ERSA), 48% to clindamycin, 55% to azithromycin, 58.7% to spiramycin, 34.7% to telithromycin, and 0.4% to quinupristin-dalfopristin, respectively. No strain resistant to linezolid was found. The prevalence of constitutive (cMLSB), inducible (IMLSB), and macrolides and type B streptogramins (M/MSB) among ERSA isolates (237 MRSA, 45 MSSA) was 69.6%, 18.2%, and 12.2% in MRSA and 28.9%, 40%, and 31.1% in MSSA, respectively. In conclusions, the prevalence of cMLSB was predominant in MRSA; while in MSSA strains, iMLSB and M/MSB phenotype were more higher than cMLSB phenotype resistance. The resistance to quinupristindalfopristin was very low, and linezolid was considered as the most effective antibiotic against all S.aureus strains.

Keywords:
Staphylococcus aureus
macrolide
lincosamide
streptogramin B
ketolid
linezolid
MLSB
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