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Early pregnancy vaginal microbiome imbalance emerges as a potential biomarker for first-trimester bleeding and miscarriage risk, while Lactobacillus-dominant flora appears to support gestational stability.
First-trimester bleeding remains one of the earliest warning signs of pregnancy instability, yet the biological mechanisms underlying this complication are not fully understood. As interest grows in the role of maternal microbial ecosystems in reproductive health, attention has increasingly shifted towards the vaginal microbiome as a potential determinant of early gestational success. To clarify this emerging relationship, researchers synthesized the available evidence examining whether specific microbial signatures were linked to bleeding episodes, miscarriage, and other adverse maternal outcomes during the first trimester.
The investigators executed a systematic review and meta-analysis as per the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) 2020 recommendations. Key databases including Google Scholar, Web of Science, PubMed, Scopus, and Embase were searched for studies that examined vaginal or cervical microbiota during early pregnancy (≤14 weeks). Eligible studies included pregnant women assessed for vaginal microbial composition and reported associations with first-trimester bleeding or adverse pregnancy outcomes.
The meta-analysis pooled evidence from 33 studies involving 12,487 pregnant women, revealing a consistent relationship between vaginal microbial composition and early pregnancy outcomes. Women with evidence of vaginal dysbiosis generally experienced a higher likelihood of first-trimester bleeding and pregnancy loss, although substantial variation was observed across studies. The strongest associations were identified for Ureaplasma species and bacterial vaginosis-associated organisms, while a Lactobacillus-dominant vaginal environment appeared to confer protection (Table 1).
Subgroup analyses further suggested that these associations were more pronounced in Asian and African populations. Despite considerable heterogeneity among studies, no evidence of significant publication bias was detected. The results positioned the vaginal microbiome as more than a passive bystander in early gestation, suggesting that microbial community structure may actively shape pregnancy trajectories from the earliest weeks of development.
As microbiome science continues to move toward clinical application, early microbial profiling could emerge as a valuable component of personalized obstetric risk assessment and preventive prenatal care.
African Journal of Reproduction and Gynaecological Endoscopy
Vaginal Microbiome Dysbiosis and First-Trimester Bleeding: A Systematic Review and Meta-Analysis of Maternal Outcomes
Elaveyini Uthaman et al.
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