Emergence of extended spectrum-β-lactamase-producing escherichia coli O25b-ST131: A major community-acquired uropathogen in infants

Ming Fang Cheng, Wan Ling Chen, Wan Yu Hung, I. Fei Huang, Yee Hsuan Chiou, Yao Shen Chen, Susan Shin Jung Lee, Chih Hsin Hung, Jiun Ling Wang

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Background: Escherichia coli sero-group O25b-sequence type 131 (O25b-ST131), a multidrug-resistant clonal group, is a significant pathogen in adults and children. This study investigated the genotyping and role of extended spectrum β-lactamase (ESBL)-producing E. coli O25b-ST131 and non-O25b-ST131 in urinary tract infections in infants. Methods: Clinical and laboratory data from 111 infants less than 1 year of age, who were hospitalized for urinary tract infections caused by ESBL-producing E. coli between 2009 and 2012 were collected. Polymerase chain reactions and multi-locus sequence typing were used to identify E. coli O25-ST131 clones. The gene blaCTX-M groups 1, 2 and 9, a specific polymerase chain reaction of CTX-M 14 and 15, were also determined in ESBL-producing E. coli isolates. Results: O25b-ST131 accounted for 65% of the 111 isolates, although 92 isolates belonged to the blaCTX-M group 9, of which most were CTX-M-14. Those with O25b-ST131 clones had similar risk factors, clinical features and outcomes as those with non-O25b-ST131. The E. coli O25b-ST131 isolates were more resistant to ciprofloxacin and gentamicin, but more susceptible to cefoxitin, minocycline and trimethoprim/sulfamethoxazole than the non-O25b-ST131 isolates. Most of the infants (78%) were previously healthy with no apparent risk factors. Conclusions: E. coli O25b-ST131 is a major community-acquired uropathogen in the infant population. Regardless of O25b-ST131 or non-O25b-ST131 clones, CTX-M-14 accounts for majority of the ESBL genotype. The O25b-ST131 clone is not associated with more severe clinical disease, but it may make the diagnosis and selection of antimicrobials for treatment more challenging.

Original languageEnglish
Pages (from-to)469-475
Number of pages7
JournalPediatric Infectious Disease Journal
Issue number5
Publication statusPublished - 2015 May 21

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Microbiology (medical)
  • Infectious Diseases


Dive into the research topics of 'Emergence of extended spectrum-β-lactamase-producing escherichia coli O25b-ST131: A major community-acquired uropathogen in infants'. Together they form a unique fingerprint.

Cite this