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Localization and therapy of urinary tract infections of childhood
Insights
Elevated C-reactive protein (CRP) levels in children indicate a severe urinary tract infection (UTI), often caused by E. coli K1 strains. Shorter antibiotic courses may be effective for less severe infections.
Area of Science:
- Pediatric Infectious Diseases
- Clinical Microbiology
- Biomarkers in Infection
Background:
- Urinary tract infections (UTIs) are common in children, with varying clinical presentations and causative agents.
- Accurate localization of UTIs is crucial for effective treatment and preventing long-term complications.
- C-reactive protein (CRP) is a known inflammatory marker, but its specific role in localizing pediatric UTIs requires further investigation.
Purpose of the Study:
- To investigate the correlation between serum C-reactive protein (CRP) levels and clinical characteristics of pediatric urinary tract infections (UTIs).
- To evaluate the utility of CRP in identifying specific bacterial strains, such as Escherichia coli (E. coli) K1, and predicting radiographic abnormalities.
- To assess the efficacy of shorter antibiotic treatment durations for children with lower CRP levels.
Main Methods:
- Prospective study of 104 children with 124 episodes of UTIs.
- Serum CRP levels were measured at diagnosis.
- Clinical data, bacterial typing (including E. coli K1), antibody-coated bacteria test, and radiographic findings were analyzed.
- Treatment outcomes for different CRP levels and infection durations were compared.
Main Results:
- Children with CRP ≥ 30 µg/ml (CRP-pos) were older, presented differently, and had a higher frequency of E. coli K1 infections and radiographic abnormalities compared to CRP-neg patients.
- E. coli K1 strains were significantly more prevalent in CRP-pos patients.
- The antibody-coated bacteria test showed low sensitivity and specificity for infection localization.
- Patients with CRP-neg infections treated with four days of antibiotics showed similar success rates to those treated for ten days.
Conclusions:
- Serum CRP levels are a valuable tool for localizing urinary tract infections in children, differentiating severe cases often associated with E. coli K1.
- The antibody-coated bacteria test is not a reliable indicator for UTI localization in pediatric patients.
- Shorter antibiotic courses (four days) appear effective for treating less severe UTIs (CRP-neg) in children.
Abstract:
One hundred four patients with 124 episodes of urinary tract infection were studied. Serum C-reactive protein (CRP) was determined on diagnosis of each patient. Children with a CRP equal to or greater than 30 micrograms/ml (CRP-pos) differed significantly from those with values less than 30 micrograms/ml (CRP-neg) in age, clinical presentation, K type of Escherichia coli causing disease, frequency or radiographic abnormalities, and presence of antibody coating of bacteria in the urinary sediment. E. coli K1 strains caused disease significantly more often in CRP-pos than in CRP-neg patients, and children with K1 infections were younger than those with non-K1 infections. The antibody-coated bacteria test was neither sensitive nor specific for localization of infection in pediatric patients. Determination of K1 antibody concentrations in serum and urine of E. coli K1-infected children provided data supporting the measurement of CRP as one means of localizing urinary tract infections. Patients with CRP-neg infections were treated as successfully with four days of antimicrobial therapy as with ten days.