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Updated: Sep 23, 2025

Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment
Published on: November 17, 2018
The resistance within: Antibiotic disruption of the gut microbiome and resistome dynamics in infancy
Robert Thänert1, Sanjam S Sawhney2, Drew J Schwartz3
1The Edison Family Center for Genome Sciences and Systems Biology, Washington University School of Medicine, St. Louis, MO, USA; Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA.
Insights
Early antibiotic use in infants disrupts gut microbiome development and increases antibiotic resistance genes (ARGs). This review examines the acute and lasting effects on pediatric health and the gut resistome.
Area of Science:
- Microbiology
- Pediatric Health
- Genetics
Background:
- Infant gut microbiome development is crucial for health.
- Antibiotic exposure in early life disrupts this process.
- Antibiotics promote antibiotic-resistant bacteria and resistance genes.
Purpose of the Study:
- To review the impacts of early-life antibiotic exposure on pediatric health.
- To examine effects on gut microbiome maturation and the resistome.
- To highlight knowledge gaps in antibiotic resistance.
Main Methods:
- Literature review of studies on infant antibiotic exposure.
- Analysis of impacts on gut microbiota composition.
- Assessment of antibiotic resistance gene (ARG) dynamics.
Main Results:
- Antibiotics alter normal gut microbiota maturation.
- Increased abundance of resistant bacteria and ARGs observed.
- Both acute and persistent effects on pediatric health are noted.
Conclusions:
- Early-life antibiotic exposure poses significant risks to infant health.
- The gut resistome is profoundly affected, contributing to rising resistance.
- Further research is critical to address antibiotic resistance acquisition and spread.
Abstract:
Intestinal host-microbiota interactions during the first year of life are critical for infant development. Early-life antibiotic exposures disrupt stereotypical gut microbiota maturation and adversely affect childhood health. Furthermore, antibiotics increase the abundance of resistant bacteria and enrich the resistome-the compendium of antibiotic resistance genes-within the gut microbiota. Here, we discuss acute and persistent impacts of antibiotic exposure during infancy on pediatric health, the gut microbiome, and, particularly, the resistome. Reviewing our current understanding of antibiotic resistance acquisition and dissemination within and between microbiomes, we highlight open questions, which are imperative to resolve in the face of rising bacterial resistance.
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