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Background: Extended spectrum β-lactamase (ESBL) producing gram negative organisms particularly the multi-drug resistant strains have become a major global health problem. Aims: The present study was aimed at determining the prevalence of extended spectrum β-lactamase (ESBLs) production in gram negative bacterial isolates obtained from various clinical isolates and to detect their antibiotic sensitivity pattern. Material and Methods: A total of 173 gram negative isolates obtained from various clinical specimens were processed by conventional methods and the ESBL detection was done by phenotypic confirmatory disc diffusion test along with the routine susceptibility testing recommended by CLSI. Results: 82 (47.4%) among the 173 gram negative isolates were ESBL producers. The most common ESBL producing organism was E.coli (53.08%). The isolates from pus (59.61%) showed the maximum ESBL production. Carbepenems were found to the most effective drug against ESBL producers. Conclusion: The high rate of ESBL production along with high degree of antibiotic co-resistance among the ESBL strains in our study emphasizes on the need for routine surveillance of ESBL among gram negative isolates using the phenotypic confirmatory test which can help the clinicians in early and effective disease management. KeywordsExtended spectrum β-lactamase (ESBL), Gram negative bacteria, Phenotypic confirmatory test, Cephalosporins

STUDY ON PHENOTYPIC DETECTION OF ESBL IN GRAM NEGATIVE BACTERIAL ISOLATES IN A TERTIARY CARE HOSPITAL IN BANGALORE