Species prevalence, antimicrobial susceptibility of enterococci isolated from various clinical samples in tertiary care hospital
Keywords:
enterococcus, vancomycin resistant, HLGRAbstract
Introduction: Emergence of multidrug resistant nosocomial enterococcus strains emphasizes the need for further investigating enterococci. Objectives: To characterize enterococci from various clinical specimens, to determine the antimicrobial susceptibility pattern and to explore the association between virulence factors and antimicrobial resistance. Material and Methods: Two hundred and eighty three clinical isolates of enterococcus were speciated and subjected to antimicrobial susceptibility testing using Kirby Bauer disc diffusion method. They were screened for vancomycin resistance by vancomycin screening agar method as recommended by Clinical Laboratory Standards Institute 2020, and confirmed by determination of minimum inhibitory concentration using agar dilution and E test. Genotypic confirmation was done by polymerase chain reaction. Results: Of the 283 enterococci isolated, 12 species were identified; predominant species was Enterococcus faecalis (82.33%). High level gentamicin resistance (HLGR) and vancomycin resistance were observed among 55.57% and 6.01% of Enterococcus isolates respectively. All vancomycin resistant enterococci (VRE) were Enterococcus faecalis and had vanA phenotype and genotype. Sensitivity to linezolid was 100 per cent among enterococci. Conclusion: Our study reveals the occurrence of sizable number of HLGR isolates and emergence of VRE.
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