Intestinal microbiome as a risk factor for urinary tract infections in childrenOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This case-control study tested whether the intestinal microbiome influences the risk of urinary tract infection in children. Because urinary pathogens originate from the gut, researchers hypothesized the gut environment reflects that risk. They sequenced regions of the bacterial 16S rRNA gene and applied the LEfSe algorithm. They also measured fecal lactoferrin and iron and used quantitative PCR for Escherichia coli.
Who was studied?
The prospective cohort compared 37 children who had a febrile urinary tract infection with 69 healthy children. Fecal samples were analyzed from both groups. The design accounted for previous antimicrobial use, which did not associate with the intestinal microbiome. The children spanned infancy and preschool ages, and both boys and girls were included.
What were the most important findings?
At the phylum level there were no significant differences between the groups. At the genus level, Enterobacter was more abundant in infection patients, with a linear discriminant analysis score above 3 (log 10). Peptostreptococcaceae were more abundant in healthy children, also with a score above 3. In total, 20 operational taxonomic units differed significantly in abundance. The relative abundance of Escherichia coli was 1.9 percent in patients versus 0.5 percent in controls. Fecal iron and lactoferrin concentrations were similar between groups.
What are the greatest implications of this study?
The family and genus level differences imply the gut environment is linked with urinary tract infection risk in children. A gut enriched in Enterobacter and depleted of certain commensals may favor infection. The differences were modest and the Escherichia coli confidence intervals crossed zero, so the link is suggestive rather than definitive. Larger studies are needed to confirm whether shaping the gut microbiome could reduce infection risk.