Introduction: Urinary tract infection (UTI) continues to be the most common infection diagnosed in outpatients as well as in hospitalized patients. Citrobacter spp. is an emerging urinary pathogen. The present study assessed the prevalence and antibiotic sensitivity pattern of Citrobacter spp. in patients admitted to or attending outpatient departments with Complain of UTI in a tertiary care hospital.
Materials and Methods: A total of 36,250 urine samples were included in the study. UTI was confirmed in 7099 samples. Of these 246 (3.46%) had UTI due to Citrobacter spp. Identification was by conventional biochemical methods. Antimicrobial susceptibility testing was performed using Kirby-Bauer disc diffusion method as recommended by Clinical and Laboratory Standards Institute M2-A9. Multidrug-resistant (MDR) was defined as resistance to more than two groups of drugs. Extended spectrum beta-lactamase (ESBL), AmpC, and metallo beta-lactamase (MBL) were detected by phenotypic methods. Results: Females predominated in the study 193 (78.4%) with 53 (21.5%) males. Most of the isolates were in the age group 21-30 and 31-40. 49 (19.9%) patients were inpatients, and 197 (80.08%) were outpatients. Aminoglycosides had a better spectrum of antimicrobial sensitivity (70.2%) with 85.2% isolates sensitive to amikacin. Fluoroquinolones had a poor activity against Citrobacter (46% sensitive). Ureidopenicillins had poor efficacy (15.4%). Out of the 246 strains, 129 (52.4%) were MDR, 61 (24.7%) of which were ESBL producers and 65 (26.4%) were AmpC producers. Most of the ESBL producing strains were isolated from inpatients. No MBL were identified in this study. Conclusion: Citrobacter though not uncommon isolate is posing a problem due to its MDR character. Infection control practices should be observed strictly, and any type of unnecessary instrumentation should be avoided.

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