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  2. Women and their microbiota
  3. Role of the vaginal microbiota in the health of the reproductive system and that of future generations
My microbiota as a woman

Role of the vaginal microbiota in the health of the reproductive system and that of future generations

Women health
The vaginal microbiota

For several years, investigators have focused on the intestinal microbiota, but they are now widening their research to the vaginal bacterial community which could play a major role in the health of women and their babies.7 Some scientists8 believe microbes to be the most precious legacy a mother passes on to her child.

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This article is based on scientific information

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About this article

Created 09 October 2019
Updated 06 March 2024

30% 1 in 3 women are aware that delivery (vaginally or cesarean section) has an impact on the newborn’s gut microbiota

Learn more:
What women know (and don't know) about their vaginal microbiota

The composition of the vaginal microbiota changes throughout women’s lives: while it has a particularly low content of Gardnerella vaginalis, Prevotella and lactobacilli before puberty, it becomes almost exclusively colonized by lactobacilli after puberty. Lactobacilli ensure women’s health by fighting against pathogens. Their decrease is associated to various gynecological disorders, such as premature delivery, infertility, sexually transmitted infections or even pelvic inflammatory diseases. Shortly before menopause, hormonal variations cause significant changes in the composition of the vaginal microbiota which finds a different balance after menopause.

Microbes and reproduction

Vaginal microbiota also seems to play a role in conception, whether it is natural or by means of in vitro fertilization (IVF). The presence of Gardnerella vaginalis and Atopobium vaginae in the vaginal microbiota was associated to lower success rates, while treatment of bacterial vaginosis, which is frequent in infertile women, improves pregnancy rate. Success also depends on the proportion of lactobacilli in seminal fluids as well as the presence of some species in the Fallopian tubes and the uterine mucosa (endometrium), whose microbiota could either favor or limit chances of embryo implantation.

The baby’s health starts in the uterus

The baby’s immune and metabolic systems could be determined during intrauterine life through its exposure to maternal microbes which are present in the placenta and amniotic liquid and can also be found in the newborn’s first stools (meconium). At present, it is unknown if the placenta hosts its own microbiota. It is known however, that it is similar to the maternal oral flora, which could explain why pregnant women with periodontal diseases have an increased risk of facing pregnancy-related complications. Moreover, changes in its composition are associated to premature births.

Risks and benefits

Although the mother is a source of microbes for her baby, other factors come into play to modulate the baby’s microbiota. Use of antibiotics by the mother (especially in the second or third trimesters of pregnancy) as well as cesarean delivery (because the newborn does not come into contact with the mother’s vaginal microbiota) are associated with an increased risk of childhood obesity. On the contrary, probiotics seem to benefit the mother and her unborn child, according to the researcher Jessica Younes. In pregnant women, they could reduce the risk of premature delivery, gestational diabetes, postpartum depression or urinary and vaginal infections; whereas in the newborn child they could limit colic, predisposition to developing allergies (atopy), resistance to antibiotics and could also reduce— or even eliminate—the risk of necrotizing enterocolitis which is a fatal disease. Finally, breastfeeding or formula feeding could play a significant role in the child’s microbiota composition, although its impact on childhood health remains unknown.

Sources

7 Younes JA, Lievens E, Hummelen R, et al. Women and Their Microbes: The Unexpected Friendship. Trends Microbiol. 2018 Jan;26(1):16-32. 

8 “Women and their Microbes”, conferences organized in Amsterdam in 2015 and 2016.

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Pregnancy Microbiome Flora

    See also

    Actu GP : Endométriose : le microbiote vaginal comme outil prédictif de sévérité ? Can the vaginal microbiota be used as a tool for predicting the severity of endometriosis?
    Actu GP : Vaginose bactérienne : bientôt une greffe de microbiote vaginal ? Bacterial vaginosis: could there soon be a vaginal microbiota transplant ?
    Focus
    Women and their microbiota
    • Microbiota, vulvovaginal infections and cystitis
      • Is bacterial vaginosis a disease?
      • Escherichia coli or the influence of intestinal microbiota on urinary tract infections
      • Are certain women predisposed to STIs?
    • Reproductive health, pregnancy and postpartum
      • Role of the vaginal microbiota in the health of the reproductive system and that of future generations
      • Cervical microbiome in postpartum HIV-positive women
    • After menopause
      • Natural remedies against osteoporosis?
      • Oral and intestinal microbiota: towards a different management of menopause
    • Microbiota and cancer
      • Microbiota and breast cancer
      • Expert interview : Pr. Laurence Zitvogel
    Created 09 October 2019
    Updated 06 March 2024

    About this article

    To know more about this topic.

    Main topic

    Women health

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    The vaginal microbiota
    Are certain women predisposed to STIs?
    Cervical microbiome in postpartum HIV-positive women
    Focus

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    Role of the vaginal microbiota in the health of the reproductive system and that of future generations Cervical microbiome in postpartum HIV-positive women

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