Amniotic fluid from healthy term pregnancies does not harbor a detectable microbial community

Area of Science:

• Microbiology
• Virology
• Human Microbiome Research

Background:

• Conflicting data exists on the presence of intra-amniotic microbiota.
• Viral communities are recognized as crucial, yet often overlooked, components of the human microbiome.
• The exposure of the developing fetus to a viral community (virome) remains largely unknown.

Purpose of the Study:

• To characterize the virome and bacterial microbiota of amniotic fluid in uncomplicated term pregnancies.
• To address the debate surrounding the existence of an intra-amniotic microbial community.
• To understand potential early-life microbial exposures for the infant gut.

Main Methods:

• Next-generation sequencing was employed to analyze amniotic fluid samples.
• Bacterial microbiota and viral communities (virome) were specifically targeted.
• Samples were obtained from 24 uncomplicated term pregnancies.

Main Results:

• The bacterial microbiota in amniotic fluid samples was indistinguishable from contamination controls.
• Viral reads in the amniotic fluid were sparse.
• No evidence of a core viral community was detected across the studied samples.

Conclusions:

• The findings challenge the notion of a significant bacterial microbiota within the intra-amniotic environment.
• The study did not detect a substantial or core viral community in the amniotic fluid of healthy term pregnancies.
• Further research is needed to fully elucidate the microbial and viral presence, if any, in the prenatal environment.