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Low bacterial counts in infants with urinary tract infection.

Journal article
Authors Sverker Hansson
Per Brandström
Ulf Jodal
P Larsson
Published in The Journal of pediatrics
Volume 132
Issue 1
Pages 180-2
ISSN 0022-3476
Publication year 1998
Published at Institute for the Health of Women and Children, Dept of Paediatrics
Pages 180-2
Language en
Keywords Bacterial Infections, urine, Colony Count, Microbial, Humans, Infant, Pyuria, microbiology, urine, Urinary Tract Infections, microbiology, urine, Vesico-Ureteral Reflux, microbiology, urine
Subject categories Pediatrics


We analyzed the number of colony-forming units in urine cultures obtained by suprapubic aspiration in a group of 366 unselected infants with symptomatic urinary tract infection to relate these findings to factors such as pyuria and vesicoureteric reflux. Seventy-three (20%) of 366 infants had fewer than 100,000 colony-forming units per milliliter. Such low counts were significantly related to low numbers of leukocytes in the urine. Vesicoureteric reflux was equally distributed among children, irrespective of the number of bacteria in quantitative culture. The findings emphasize the importance of sampling technique; in infants, the method of choice is suprapubic aspiration, or catheterization, which eliminates the risk that urinary tract infection is overlooked because of low bacterial counts.

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