The microbiome in urogenital schistosomiasis and induced bladder pathologiesOriginal 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 cross-sectional study examined the urinary microbiome in urogenital schistosomiasis and its induced bladder pathologies. The aim was to find microbiome features and functions that change with infection and disease progression. Researchers sequenced the V3 region of the 16S rRNA gene from morning urine. Participants were screened for Schistosoma haematobium eggs by microscopy and PCR, and for bladder pathology by ultrasound.
Who was studied?
The cohort was 70 adults from Eggua in southwestern Nigeria, comprising 36 males and 34 females aged 15 to 65. They were grouped by infection and bladder pathology status: advanced (infection plus pathology), pathology-only, infection-only, and controls. Diet was uniform and starch-based. Participants with recent antibiotics, painful bladder, or suspected common urinary tract infection were excluded to reduce confounding.
What were the most important findings?
Proteobacteria (mean 70 percent) and Firmicutes (26 percent) dominated the urinary microbiome across all groups. Proteobacteria was highest in pathology-only cases (80 percent) and lowest in advanced cases (42 percent). The microbial community differed significantly between infected and non-infected persons at genus level (p equals 6.55e-10). Fusobacterium, Sphingobacterium, and Enterococcus, all immune-stimulatory, distinguished pathology from infection alone or from healthy persons. Sphingobacterium was projected as a marker of infection. Beneficial taxa such as Trabulsiella and Weissella marked non-infected persons. Predicted functions shifted toward cellular maintenance and away from lipid metabolism.
What are the greatest implications of this study?
The findings position the urinary microbiome as a factor in schistosomiasis biomarkers, diagnostics, and treatment. Immune-stimulatory taxa may help maintain or initiate bladder pathology, complementing inflammation from parasite eggs. The rural African urinary profile differed from prior European and North American studies. Small sample size and uncertain long-term stability limit conclusions, and associations do not prove these microbes cause the observed pathologies.