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Development of the Oral Microbiota01:28

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The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
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Related Experiment Video

Updated: Apr 23, 2026

Human Placental and Decidual Organ Cultures to Study Infections at the Maternal-fetal Interface
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Is a foetus developing in a sterile environment?

T M Wassenaar1, P Panigrahi

  • 1Molecular Microbiology and Consultants, Zotzenheim, Germany.

Letters in Applied Microbiology
|October 3, 2014
PubMed
Summary
This summary is machine-generated.

A healthy pregnancy may not mean a sterile uterus, as research reveals a common placental microbiome. This challenges previous beliefs by identifying frequent bacterial colonization in the placenta.

Keywords:
amniotic fluidbreast milkneonatal sepsisnewborn colonizationplacenta microbiomeplacental microbiomepreterm birth

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Area of Science:

  • Reproductive microbiology
  • Maternal-fetal medicine
  • Microbiome research

Background:

  • The traditional view held that a healthy pregnancy is characterized by a sterile uterus.
  • Emerging evidence suggests microbial presence within the uterine environment during pregnancy.

Purpose of the Study:

  • To review current literature on the placental microbiome.
  • To differentiate between pathological bacterial colonization and a commensal placental microbiome.
  • To update the understanding of pregnancy-associated microbiology.

Main Methods:

  • Literature review and synthesis of recent findings.
  • Analysis of studies investigating microbial presence in placental tissues.
  • Comparative analysis of bacterial profiles in healthy versus complicated pregnancies.

Main Results:

  • The placenta is frequently colonized by bacteria, indicating the existence of a placental microbiome.
  • Distinguishing between a normal microbiome and infection is crucial for accurate diagnosis.
  • Evidence challenges the paradigm of a sterile uterus in healthy pregnancy.

Conclusions:

  • The presence of a placental microbiome is increasingly recognized.
  • Further research is needed to define the characteristics of a healthy placental microbiome.
  • Clinical interpretation must differentiate between microbial colonization and pathogenic infection.