Diverse vaginal microbiomes in reproductive-age women with vulvovaginal candidiasisOriginal 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?
Researchers profiled vaginal bacterial communities in reproductive-age women with vulvovaginal candidiasis (VVC), bacterial vaginosis (BV), mixed VVC/BV infection, and healthy controls. The study used Illumina 16S rRNA sequencing on 226 vaginal swabs from 95 women in Guangzhou, China.
What did they find?
Species diversity increased in the order healthy controls, VVC only, mixed BV/VVC, then BV alone, with each pair differing significantly. VVC-only samples showed no single pattern: about 54 percent resembled normal Lactobacillus-dominant communities, 18 percent resembled BV-like communities rich in Gardnerella, and the rest fell between. Mixed BV/VVC samples formed a distinct profile, with higher Lactobacillus than BV alone but also elevated Prevotella, Gardnerella, and Atopobium compared to controls.
What happened after treatment?
Among 19 follow-up subjects, treatment produced inconsistent shifts in vaginal microbiota. Four mixed BV/VVC samples regained higher Lactobacillus levels, but many VVC-only patients did not return to a Lactobacillus-dominant profile despite symptom improvement.
Why it matters
The findings suggest earlier culture-based and fingerprinting studies missed this heterogeneity, and that VVC cannot be characterized by one vaginal microbiome signature. The authors note pH did not correlate with community diversity among VVC subgroups.