Frequency and antimicrobial susceptibility pattern of hospital isolates of Escherichia coli and Klebsiella pneumoniae in urine samples

Ivana Jukić, Danijel Topić, El-Jesah Đulić, Amela Dedeić- Ljubović


Objectives/Aim: Urinary tract infections (UTI) are a serious public health problem and caused by many pathogens, most often by Escherichia coli and Klebsiella pneumoniae.

Aim of this study was to show the frequency and antimicrobial susceptibility pattern of E. coli and K. pneumoniae in hospital isolates, following the GLASS methodology.

Methods: This is a retrospective study that was conducted in the Laboratory for Urinary Infections OU Clinical Microbiology CCUS in the period from January till December 2018.

A total of 13760 urine samples were processed, using standard laboratory methods, in which significant bacteriuria was detected in 3218 (23.4%) of specimens.

Results: Out of the total number of positive samples, E. coli was isolated in 1166 (36.2%) and K. pneumoniae at 341 (10.6%) patients. The presence of E. coli and K. pneumoniae isolates is dominant in females (1103/73.2%) and age group 60 and older (812/54.7%). Out of the total E. coli isolates, the ESBL strain was presented with 79 (6.8%) and K. pneumoniae with 145 (42.5%). The proportion of carbapenemase (CPE) produced by K. pneumoniae isolates was 8 (2.4%). The ESBL strain distribution analysis on clinics showed the highest prevalence of both isolates at the Clinic for Nephrology: K. pneumoniae 26/17,9%; E. coli: 12/15.4%. Isolated E. coli showed the highest resistance to ampicillin 673/1166 (57,7%), trimethoprim-sulfamethoxazole 454/1166 (38.9%) and ciprofloxacin 253/970 (26.1%), while K. pneumoniae to ciprofloxacin and trimethoprim-sulfamethoxazole with 151/285 (53.0%) and 164/341 (48.1%), respectively.

Conclusions: Our study has shown that the most common cause of urinary infections in hospital settings are E. coli and K. pneumoniae. Data analysis showed that the presence of ESBL isolates was significantly higher in K. pneumoniae than E. coli. CPE isolates of K. pneumoniae were also detected.


urinary tract infection, Escherichia coli, Klebsiella pneumoniae, antimicrobial resistance

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DOI: 10.5457/ams.v49i0.527