Pediatric Nephrology

, Volume 31, Issue 2, pp 239–245 | Cite as

Urinary tract infection in infants: the significance of low bacterial count

  • Svante Swerkersson
  • Ulf Jodal
  • Christina Åhrén
  • Rune Sixt
  • Eira Stokland
  • Sverker Hansson
Original Article



In national guidelines for urinary tract infection (UTI) in children, different cut-off levels for defining bacteriuria are used. In this study, the relationship between bacterial count in infant UTI and inflammatory parameters, frequency of vesicoureteral reflux (VUR), kidney damage, and recurrent UTI was analyzed.


We conducted a population-based retrospective study of 430 infants age <1 year with symptomatic UTI diagnosed by suprapubic aspiration. Clinical and laboratory parameters, findings on voiding cystourethrography and 99mtechnetium dimercapto-succinic acid scintigraphy, and frequency of recurrence were related to bacterial count at the index UTI.


Eighty-three (19 %) infants had bacterial counts <100,000 colony-forming units (CFU)/ml and 347 (81 %) had ≥100,000 CFU/ml. There was similar frequency of VUR (19 % in both groups), kidney damage (17 and 23 %, p = 0.33) and recurrent UTI (6 and 12 %, p = 0.17) in the low and high bacterial group. Non-E. coli species were more prevalent (19 versus 6 %, p = 0.0006) and mean C-reactive protein was lower (50 vs. 79 mg/l, p <0.0001) in the low bacteria group.


UTI with low bacterial count is common and of importance since it may be associated with VUR and renal damage. Non-E. coli species and low inflammatory response were more prevalent in UTI with low bacterial count.


Urinary tract infection Bacterial count Vesicoureteral reflux Kidney damage Children Infants 


Conflict of interest

The authors declare no conflicts of interest.

Ethical approval

The study was approved by the Regional Ethical Review Board in Gothenburg (278-08).


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Copyright information

© IPNA 2015

Authors and Affiliations

  • Svante Swerkersson
    • 1
    • 6
  • Ulf Jodal
    • 1
  • Christina Åhrén
    • 2
    • 3
  • Rune Sixt
    • 4
  • Eira Stokland
    • 5
  • Sverker Hansson
    • 1
  1. 1.Department of Pediatrics, The Queen Silvia Children’s HospitalSahlgrenska University HospitalGothenburgSweden
  2. 2.Department of Clinical Bacteriology, Sahlgrenska AcademyUniversity of GothenburgGothenburgSweden
  3. 3.STRAMA, The Swedish Strategic Programme against Antibiotic ResistanceGöteborgSweden
  4. 4.Pediatric Clinical Physiology, The Queen Silvia Children’s HospitalSahlgrenska University HospitalGothenburgSweden
  5. 5.Pediatric Radiology, The Queen Silvia Children’s HospitalSahlgrenska University HospitalGothenburgSweden
  6. 6.Pediatric Uronephrologic Center, The Queen Silvia Children’s HospitalSahlgrenska University HospitalGöteborgSweden

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