The endometrial microbiota of women with or without a live birth within 12 months after a first failed IVF/ICSI cycle

Bich Ngoc Bui*, Nienke van Hoogenhuijze, Marco Viveen, Femke Mol, Gijs Teklenburg, Jan Peter de Bruin, Dagmar Besselink, Linda Stevens Brentjens, Shari Mackens, Malbert R.C. Rogers, Gaby S. Steba, Frank Broekmans, Fernanda L. Paganelli, Janneke H.H.M. van de Wijgert

*Corresponding author for this work

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The endometrial microbiota composition may be associated with implantation success. However, a 'core' composition has not yet been defined. This exploratory study analysed the endometrial microbiota by 16S rRNA sequencing (V1-V2 region) of 141 infertile women whose first IVF/ICSI cycle failed and compared the microbiota profiles of women with and without a live birth within 12 months of follow-up, and by infertility cause and type. Lactobacillus was the most abundant genus in the majority of samples. Women with a live birth compared to those without had significantly higher Lactobacillus crispatus relative abundance (RA) (p = 0.029), and a smaller proportion of them had ≤ 10% L. crispatus RA (42.1% and 70.4%, respectively; p = 0.015). A smaller proportion of women in the male factor infertility group had ≤ 10% L. crispatus RA compared to women in the unexplained and other infertility causes groups combined (p = 0.030). Women with primary infertility compared to secondary infertility had significantly higher L. crispatus RA (p = 0.004); lower proportions of them had ≤ 10% L. crispatus RA (p = 0.009) and > 10% Gardnerella vaginalis RA (p = 0.019). In conclusion, IVF/ICSI success may be associated with L. crispatus RA and secondary infertility with endometrial dysbiosis, more often than primary infertility. These hypotheses should be tested in rigorous well-powered longitudinal studies.

Original languageEnglish
Article number3444
Pages (from-to)1-11
JournalScientific Reports
Publication statusPublished - 1 Mar 2023


  • Female
  • Humans
  • Infertility, Female
  • Infertility, Male
  • Live Birth
  • Male
  • Microbiota
  • Pregnancy
  • RNA, Ribosomal, 16S
  • Sperm Injections, Intracytoplasmic


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