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The purpose of the study was to compare bacterial species, clinical, laboratory and imaging findings (99m Tc-dimerca-ptosuccinic acid renal scan and voiding cystogram) in infants and children with high (≥10 5 colony forming units (CFU)/ml, group A patients) and low(≤5×104 CFU/ml, group C patients)-bacterial count in urine cultures during first episode of urinary tract infection. Group B included patients with intermediate CFU/ml. Included were 419 symptomatic patients with: (a) no previous antibiotic treatment, (b) urine samples for quantitative cultures taken by bladder catheterisation or suprapubic bladder aspiration, (c) growth of only one microorganism, and (d) age ≤54 months (age of the oldest patient of group C). Out of 419 cultures, Escherichia coli grew in 315 (75.2%), gram-negative bacteria except E. coli in 91 (21.7%) and gram-positive in 13 (3.1%). Group C patients were significantly ( P < 0.0001) more often affected with gram-ne-gative pathogens except E. coli than group A patients (21/44 versus 67/360). Most of group C patients were younger than 24 months of age; none was older than 54 months. Comparison of the prevalence of clinical and laboratory (leucocyte count, CRP, ESR) findings between groups A and C showed no significant differences. There was no statistically significant difference in the prevalence of pyelonephritis, reflux and urological malformations (except reflux) between groups A and C. Conclusion: Low bacterial count urinary tract infectionsmainly affect infants and young children and are often due to gram-negative bacteria other than E. coli. Clinical and laboratory findings, prevalence of pyelonephritis, reflux and urological malformations are similar in high and low bacterial count urinary tract infections.
The purpose of the study was to compare bacterial species, clinical, laboratory and imaging findings (99m Tc-dimerca-ptosuccinic acid renal scan and voiding cystogram) in infants and children with high (≥10 5 colony forming units (CFU) / ml, group A patients) and low (≤ 5 × 104 CFU / ml, group C patients) -bacterial count in urine cultures during first episode of urinary tract infection. Group B included patients with intermediate CFU / ml. Included were 419 symptomatic patients with: (a) no previous antibiotic treatment, (b) urine samples for quantitative cultures taken by bladder catheterisation or suprapubic bladder aspiration, (c) growth of only one microorganism, and (d) age ≤54 months (age of the oldest patient of group Gram-negative bacteria except E. coli in 91 (21.7%) and gram-positive in 13 (3.1%). Group C patients were significantly (P <0.0001) more often affected with gram-ne-gative pathogens except E. coli than g Most of group C patients were younger than 24 months of age; none was older than 54 months. Comparison of the prevalence of clinical and laboratory (leucocyte count, CRP, ESR) findings Between groups A and C showed no significant differences. There was no statistically significant difference in the prevalence of pyelonephritis, reflux and urological malformations (except reflux) between groups A and C. Conclusion: Low bacterial count urinary tract infectionsmainly affect infants and young children and are often due to gram-negative bacteria other than E. coli. Clinical and laboratory findings, prevalence of pyelonephritis, reflux and urological malformations are similar in high and low bacterial count urinary tract infections.