The Vaginal Microenvironment: The Physiologic Role of Lactobacilli .
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing physiology and host-microbe interactions without primary data or systematic search criteria.
PubMed 29951482 · doi:10.3389/fmed.2018.00181
What was done
This narrative review synthesized the physiological role, composition, adaptive mechanisms, and host interactions of the vaginal microbiome in healthy states and disease conditions such as dysbiosis, bacterial vaginosis, and infections.
What was found
The abstract reports no numerical findings or statistical measures. Qualitatively, it describes how high-estrogen states promote vaginal epithelial maturation and glycogen accumulation, fostering Lactobacillus species that lower pH via lactic acid production and generate antimicrobial/anti-inflammatory products to defend against bacterial, viral, fungal, and protozoan pathogens.
Why it matters
It outlines the biological mechanisms linking Lactobacillus-dominated vaginal eubiosis to reduced susceptibility to sexually transmitted infections and improved reproductive outcomes including conception and pregnancy timing.
Limits
The abstract describes a broad narrative synthesis lacking systematic search methodology, formal study inclusion criteria, risk-of-bias evaluation, and quantitative data.
Cited by
- supports Estrogen increases glycogen production in the vaginal canal, which feeds Lactobacilli that produce lactic acid to maintain vaginal pH.