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Antibiotic resistance pattern of Enterococci isolates from nosocomial infections in a tertiary care hospital in Eastern India

Posted on : July 6, 2015 By
Article Type Issue Original Article Vol 6, Issue 2 

Atreyi Chakraborty1, Nishith K Pal2, Soma Sarkar1, Manideepa Sen Gupta1
1Department of Microbiology, Medical College, Kolkata, West Bengal, India.
2Department of Microbiology, Nil Ratan Sircar Medical College, Kolkata, West Bengal, India.
DOI: 10.4103/0976-9668.160018

ABSTRACT

Background: Resistance to commonly used antibiotics by Enterococci causing nosocomial infections is of concern, which necessitates judicious, responsible and evidence-based use of antibiotics. The present study was conducted to review the prevalence and identify therapeutic options for nosocomial Enterococcal infections in our tertiary care hospital. Materials and Methods: Isolates identified by morphological and biochemical characteristics were tested for antibiotic susceptibility using Kirby-Bauer method. Result: 153 of 2096 culture positive clinical samples comprised of 101 urine, 30 wound swab/pus, 13 blood and 09 high vaginal swab isolates were identified as Enterococcus faecalis (90.85%), Enterococcus faecium (8.50%) and Enterococcus gallinarum (0.65%). Enterococci accounted for 8.45%, 4.53%, 4.23%, 4.43% of urinary, wound swab or pus, blood, high vaginal swab isolates respectively, causing 7.3% of all nosocomial infections. Significant number of Enterococci isolated from nosocomial urinary tract infection (66.01%) and wound infections (19.6%) were multidrug resistant (MDR). Although all isolates were sensitive to vancomycin and linezolid, resistance to erythromycin (71.24%) and ciprofloxacin (49.67%) was frequently observed. High-level gentamicin resistance was observed in 43.88%, and 61.53% of E. faecalis and E. faecium isolates respectively. Minimal inhibitory concentration of vancomycin of all the isolates were ≤1 μg/ml. 7% of the Enterococcal isolates were MDR strains and vancomycin or linezolid were the only effective antibiotics. Conclusion: A combination of vancomycin and/or linezolid were effective against Enterococci causing nosocomial infections in our tertiary care facility, nevertheless continuous and frequent surveillance for resistance patterns are necessary for judicious and evidence based use of antibiotics.

Keywords: Antibiotic resistance, Enterococcus, nosocomial infection.

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