Influence of Pregnancy History on the Vaginal Microbiome of Pregnant Women in their First Trimester Academic Article uri icon


MeSH Major

  • Autophagy
  • Epithelial Cells
  • Pregnancy Complications, Infectious
  • Streptococcal Infections
  • Streptococcus agalactiae
  • Vagina


  • Pregnancy permanently alters maternal anatomy, physiology and immunity. We evaluated if the vaginal microbiome differed between women with a first or subsequent conception. Relative abundance of bacteria in the vaginal microbiome in first trimester pregnant women, 52 with their first known conception, 26 with a prior spontaneous or induced abortion but no deliveries and 77 with at least one prior birth, was determined by classifying DNA sequences from the V1-V3 region of bacterial 16 S rRNA genes. Lactobacillus crispatus was the numerically most abundant bacterium in 76.4% of women with a first conception, 50.0% with only a prior spontaneous or scheduled abortion and 22.2% with a prior birth (p ≤ 0.01). L. iners was the most abundant bacterium in 3.8% of women with a first conception as compared to 19.2% (p = 0.03) and 20.8% (p = 0.03) in those with a prior abortion or birth, respectively. Gardnerella as the most abundant bacterial genus increased from 3.8% in women with a first conception to 15.4% and 14.3% in those with a prior abortion or birth, respectively (p > 0.05). L. iners dominance was also associated with a history of spontaneous abortion (p ≤ 0.02). The composition of the vaginal microbiome and its influence on pregnancy outcome varies with pregnancy history.

publication date

  • December 2017



  • Academic Article



  • eng

PubMed Central ID

  • PMC5579028

Digital Object Identifier (DOI)

  • 10.1038/s41598-017-09857-z

PubMed ID

  • 28860491

Additional Document Info

start page

  • 10201


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