African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 4955

Full Length Research Paper

Investigation of reduced glycopeptid susceptibility among methicillin resistant staphylococci

Hayati Güneş1, Emel Sesli Çetin2, Selçuk Kaya2 and Buket Cicioğlu Arıdoğan2
  1Department of Medical Microbiology, Faculty of Medicine, Namık Kemal University, Tekirdağ, Turkey. 2Department of Medical Microbiology, Faculty of Medicine, Süleyman Demirel University, Isparta, Turkey.
Email: [email protected]

  •  Accepted: 15 December 2011
  •  Published: 16 January 2012

Abstract

 

Incidence of vancomycin intermediate Staphylococcus aureus (VISA) and vancomycin hetero-intermediate Staphylococcus aureus (h-VISA) has been increasing in the world and our country. We aimed to determine whether there is any difference between the minimal inhibitory concentration (MIC) of glycopeptide antibiotics against meticillin susceptible and resistant staphylococci and investigate the prevalence of VISA and h-VISA among Staphylococcus aureus strains. 60 MRSA, MSSA, MRCNS and MSCNS isolated in our laboratory between April 2007-2008, were included in this study. Bacteria were inoculated onto a BHI agar supplemented with 6 μg/ml vancomycin, strains which have shown growth on screen agar were evaluated for being VISA/hVISA by determining PAP-AUC ratio. Vancomycin and teicoplanin MIC values of the strains were determined by microdilution and E-test methods. Two of MRSA strains which grew on screen agar were excepted as suspicious VISA/h-VISA and they were confirmed as h-VISA by PAP-AUC method. Among all strains, methicillin resistant strains showed higher MIC values for glycopeptides than methicillin susceptible strains. We suggested that clinicians should be aware of h-VISA and VISA strains which are being increasingly reported in the world. More clinically supported multisentric studies must be performed in our country to clarify these prevalence rates and determine the clinical relevance of this resistance profile.

Key words: Staphylococci, meticillin resistance, glycopeptid susceptibility, vancomycin intermediate Staphylococcus aureus (VISA), vancomycin hetero-intermediateStaphylococcus aureus (h-VISA).

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