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Microbial Genomics logo Microbial Genomics

Volume 10, Issue 7

Delivery mode is a larger determinant of infant gut microbiome composition at 6 weeks than exposure to peripartum antibiotics Open Access

Abstract

Previous research has shown that delivery mode can shape infant gut microbiome composition. However, mothers delivering by caesarean section routinely receive prophylactic antibiotics prior to delivery, resulting in antibiotic exposure to the infant via the placenta. Previously, only a small number of studies have examined the effect of delivery mode versus antibiotic exposure on the infant gut microbiome with mixed findings.

We aimed to determine the effect of delivery mode compared to antibiotic use during labour and delivery on the infant and maternal gut microbiome at 6 weeks post-partum.

Twenty-five mother–infant dyads were selected from the longitudinal Queensland Family Cohort Study. The selected dyads comprised nine vaginally delivered infants without antibiotics, seven vaginally delivered infants exposed to antibiotics and nine infants born by caesarean section with routine maternal prophylactic antibiotics. Shotgun-metagenomic sequencing of DNA from stool samples collected at 6 weeks post-partum from mother and infant was used to assess microbiome composition.

Caesarean section infants exhibited decreases in (ANCOM-BC <0.0001, MaAsLin 2 =0.041), changes to several functional pathways and altered beta diversity ( =0.056, 0.029), while minimal differences due to antibiotic exposure were detected. For mothers, caesarean delivery (0.0007) and antibiotic use (=0.016) decreased the evenness of the gut microbiome at 6 weeks post-partum without changing beta diversity. Several taxa in the maternal microbiome were altered in association with antibiotic use, with few differentially abundant taxa associated with delivery mode.

For infants, delivery mode appears to have a larger effect on gut microbiome composition at 6 weeks post-partum than intrapartum antibiotic exposure. For mothers, both delivery mode and intrapartum antibiotic use have a small effect on gut microbiome composition at 6 weeks post-partum.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): antibiotics , birth , delivery mode , gut microbiome , infant and maternal
Funding
This study was supported by the:
  • Advanced Queensland (Award 2441)
    • Principle Award Recipient: ApplicableNot
  • Perpetual Impact Funding (Award 2041)
    • Principle Award Recipient: NotApplicable
  • The Lott, Golden Casket (Award 75002_GC_20)
    • Principle Award Recipient: NotApplicable
  • Brisbane Diamantina Health Partners (Award 1033)
    • Principle Award Recipient: NotApplicable
  • Mater Foundation
    • Principle Award Recipient: NotApplicable
© 2024 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2024-07-12
2025-06-19
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Delivery mode is a larger determinant of infant gut microbiome composition at 6 weeks than exposure to peripartum antibiotics
M Gen 10, 001269 (2024); https://doi.org/10.1099/mgen.0.001269
/content/journal/mgen/10.1099/mgen.0.001269
/content/journal/mgen/10.1099/mgen.0.001269
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