The Early Intestinal Microbiota of Healthy Korean Newborns

Area of Science:

• Microbiology
• Immunology
• Neonatal Health

Background:

• The microflora hypothesis suggests gut microbiota imbalances contribute to inflammatory diseases.
• Understanding the gut microbiota of healthy newborns is crucial for modulating infant gut immunity.
• Early life gut microbial colonization plays a significant role in infant health and development.

Purpose of the Study:

• To investigate the gut microbiota composition of healthy newborns from urban environments.
• To analyze the diversity and inter-individual variability of early-life gut bacteria.
• To establish baseline data on neonatal gut microbial colonization.

Main Methods:

• Cultured fecal samples from 128 full-term newborns to quantify total bacteria, anaerobes, gram-positive bacteria, coliforms, lactobacilli, and bifidobacteria.
• Performed bivariate correlation analysis between coliforms and lactobacilli.
• Utilized Terminal Restriction Fragment Length Polymorphism (T-RFLP) with HhaI and MspI, and clustering analysis to determine microbial diversity.

Main Results:

• Bacteria were detected in 61.5% of fecal samples, with anaerobes, gram-positive bacteria, lactobacilli, coliforms, and bifidobacteria identified.
• Total bacteria and lactobacilli increased significantly in feces collected after 24 hours postpartum, while anaerobes decreased.
• A significant negative correlation was observed between lactobacilli and coliforms (r = -0.463, P < 0.001).

Conclusions:

• Neonatal bacterial colonization in urban infants is a non-sterile process.
• Early gut microbial colonization in newborns exhibits significant diversification and inter-individual variability.
• Findings contribute to understanding the foundational role of the infant gut microbiome in health and disease.