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Updated: May 27, 2026

Establishment and Characterization of UTI and CAUTI in a Mouse Model
Published on: June 23, 2015
[Urinary tract infections: antibiotic resistance and clinical follow up]
C de Lucas Collantes1, J Cela Alvargonzalez, A M Angulo Chacón
1Servicio de Pediatría, Hospital Universitario Puerta de Hierro, Majadahonda, Madrid, España. mcdelucas@yahoo.es
Insights
Urinary tract infection (UTI) treatment requires understanding local antibiotic resistance. This study found E. coli highly sensitive to fosfomycin and cefotaxime, crucial for empirical UTI treatment in children.
Area of Science:
- Pediatric infectious diseases
- Microbiology
- Antibiotic resistance
Context:
- Empirical antibiotic treatment is standard for urinary tract infections (UTIs).
- Determining local antibiotic resistance patterns is crucial for effective initial management.
- Acute pyelonephritis diagnosis requires ruling out renal scarring, a potential complication.
Purpose:
- To analyze antibiotic susceptibility patterns of common urinary pathogens in children.
- To assess the incidence of renal scarring following UTIs in pediatric patients.
Summary:
- A retrospective study analyzed UTI cases in children under 14 from 2009-2010.
- E. coli was the most frequent pathogen (80%), showing high in vitro susceptibility to fosfomycin (99.1%), cefotaxime (98.2%), cefuroxime (97.3%), and gentamicin (95.6%).
- Renal scars were identified in 19% of febrile UTI cases, 17% of outpatients, and 20% of inpatients.
Impact:
- Provides essential data on antibiotic susceptibility for empirical UTI treatment in children.
- Highlights the importance of follow-up imaging to detect renal scarring after pyelonephritis.
- Informs clinical guidelines for managing pediatric UTIs and preventing long-term complications.
Abstract:
The initial treatment of the urinary tract infections (UTI) is empirical and it is a priority to determine the antibiotic resistance of most common germs in a population. Furthermore, due to the suspicion of acute pyelonephritis the presence of renal scarring should be ruled out as this may lead to further complications. A retrospective longitudinal study was performed on all children under 14 years diagnosed with UTI from January 1 2009 to December 31 2009. The in vitro susceptibility to the most important urinary pathogens was analysed, along with the presence of scars, and a subsequent follow-up. The most frequently isolated bacteria were E. coli (80%), P. mirabilis (9.7%) and K. pneumoniae (4.2%). In the antibiogram, E coli showed a high sensitivity to fosfomycin (99.1%), cefotaxime (98.2%) cefuroxime (97.3%) and gentamicin (95.6%). The sensitivity obtained against amoxicillin-clavulanate was 83.2%, while that obtained against cotrimoxazole was 78.9%. Post-pyelonephritis scars were found in 19% of patients with febrile UTI, 17% out-patients and 20% of those admitted.
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