Fecal microflora of Greek healthy neonates

Area of Science:

• Microbiology
• Neonatal Health
• Gut Microbiome Research

Background:

• The early gut microbiome plays a crucial role in infant development and immune system maturation.
• Lactic acid bacteria and bifidobacteria are key beneficial bacteria in the infant gut.
• Mode of delivery is hypothesized to influence initial microbial colonization.

Purpose of the Study:

• To investigate the development of intestinal microflora, specifically lactic acid bacteria and bifidobacteria, in infants during the first three months of life.
• To determine the impact of delivery mode (vaginal vs. cesarean) on the colonization patterns of these bacteria.
• To identify predominant bacterial species in early neonatal gut microbiota.

Main Methods:

• Prospective collection of fecal specimens from 82 healthy, full-term infants at 4, 30, and 90 days postpartum.
• Culturing on nonselective and selective media, followed by microbiological and molecular identification of bacterial isolates.
• Comparison of colonization rates between vaginally and cesarean-delivered, exclusively breast-fed infants.

Main Results:

• Overall colonization by lactobacilli and bifidobacteria was limited until 3 months of age, despite high initial aerobic and anaerobic counts.
• Cesarean-delivered infants exhibited significantly lower colonization rates of lactobacilli (day 4) and bifidobacteria (days 4 and 30) compared to vaginally delivered infants.
• Predominant species included Lactobacillus rhamnosus, Lactobacillus johnsonii, and Lactobacillus paracasei early on, with Bifidobacterium longum and Bifidobacterium breve being common in vaginally delivered infants.

Conclusions:

• Greek infants show a restricted colonization pattern of lactic acid bacteria in early life.
• Cesarean section is associated with a delay in the development of Lactobacillus and Bifidobacterium spp. microbiota.
• Further research is needed to understand the long-term consequences of these altered colonization patterns.