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Korean J Pediatr 2017 July;60(7) :221-226.
Published online 2017 July 15.        doi:
Uropathogenic Escherichia coli ST131 in urinary tract infections in children
Ki Wook Yun1, Mi-Kyung Lee2, Wonyong Kim3, In Seok Lim4
1Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea
2Department of Laboratory Medicine, Chung-Ang University College of Medicine, Seoul, Korea
3Department of Microbiology, Chung-Ang University College of Medicine, Seoul, Korea
4Department of Pediatrics, Chung-Ang University College of Medicine, Seoul, Korea
Corresponding Author: In Seok Lim ,Tel: +82-2-6299-1476, Fax: +82-2-6264-2167, Email:
Copyright © 2017 by The Korean Pediatric Society
Purpose: Escherichia coli sequence type (ST) 131, a multidrug-resistant clone causing extraintestinal infections, has rapidly become prevalent worldwide. However, the epidemiological and clinical features of pediatric infections are poorly understood. We aimed to explore the characteristics of ST131 Escherichia coli isolated from Korean children with urinary tract infections.
Methods: We examined 114 uropathogenic E. coli (UPEC) isolates from children hospitalized at Chung-Ang University Hospital between 2011 and 2014. Bacterial strains were classified into STs by partial sequencing of seven housekeeping genes (adk, fumC, gyrB, icd, mdh, purA, and recA). Clinical characteristics and antimicrobial susceptibility were compared between ST131 and non-ST131 UPEC isolates.
Results: Sixteen UPEC isolates (14.0%) were extended-spectrum -lactamase (ESBL)-producers; 50.0% of ESBL-producers were ST131 isolates. Of all the isolates tested, 13.2% (15 of 114) were classified as ST131. There were no statistically significant associations between ST131 and age, sex, or clinical characteristics, including fever, white blood cell counts in urine and serum, C-reactive protein, radiologic abnormalities, and clinical outcome. However, ST131 isolates showed significantly lower rates of susceptibility to cefazolin (26.7%), cefotaxime (40.0%), cefepime (40.0%), and ciprofloxacin (53.3%) than non-ST131 isolates (65.7%, 91.9%, 92.9%, and 87.9%, respectively; P<0.001 for all). ESBL was more frequently produced in ST131 (53.3%) than in non-ST131 (8.1%) isolates (P<0.01).
Conclusion: ST131 E. coli isolates were prevalent uropathogens in children at a single medical center in Korea between 2011 and 2014. Although ST131 isolates showed higher rates of antimicrobial resistance, clinical presentation and outcomes of patients were similar to those of patients infected with non-ST131 isolates.
Keywords: Child | Escherichia coli | Multilocus sequence typing | Urinary tract infection
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Supplementary Material  Supplementary Material
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Molecular typing of uropathogenic Escherichia coli isolated from Korean children with urinary tract infection  2015 January;58(1)
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Regional differences in phylogenetic group of Escherichia coli strains isolated from children with urinary tract infection in Korea  2012 November;55(11)
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