Annals of Tropical Medicine and Public Health
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Year : 2012  |  Volume : 5  |  Issue : 3  |  Page : 178-180

Study of vancomycin susceptibility in methicillin-resistant Staphylococcus aureus isolated from clinical samples

1 Department of Microbiology, A. J. Institute of Medical Sciences, Mangalore, India
2 Department of Microbiology, J. J. M. Medical College, Davangere, India

Correspondence Address:
Prajna Sharma
"Mahalay", 15-9-485/1, Lobo Lane, Mallikatte, Kadri Post, Mangalore-575 002
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1755-6783.98609

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Background : Staphylococcus aureus is one of the most commonly isolated organisms in nosocomial infections. While the prevalence of methicillin--resistant Staphylococcus aureus (MRSA) continues to increase worldwide, there is a concern about an increase in vancomycin minimum inhibitory concentrations (MIC,s) among S. aureus strains. An attempt was, therefore, made to study vancomycin susceptibility in 156 MRSA isolates from various clinical samples during the period of February 2008 to January 2009. Materials and Methods: A total of 156 isolates of S. aureus were collected from various clinical specimens. MIC of vancomycin was detected by agar dilution method. Results : Out of 156 MRSA isolates all were susceptible to vancomycin by disc diffusion method. By agar dilution method, 138 isolates were susceptible to vancomycin (VISA MIC 0.5-2 μgm/ml) and 18 isolates showed intermediate susceptibility to vancomycin (VISA MIC 4-8 μgm/ml). No vancomycin resistant S. aureus (VRSA) with MIC ≥ 16 μgm/ml was detected. Conclusion : The present study reveals the emergence of MRSA with reduced susceptibility to vancomycin and indicates the magnitude of antibiotic resistance in and around Davangere.

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