Related Experiment Video
Updated: Aug 6, 2026

Breast Milk Enhances Growth of Enteroids: An Ex Vivo Model of Cell Proliferation
Published on: February 15, 2018
Does probiotics administration decrease serum endotoxin levels in infants?
1Department of Pediatric Surgery, Juntendo University School of Medicine, Tokyo, Japan.
Insights
Probiotics significantly altered infant gut microbiota, increasing beneficial anaerobic bacteria and decreasing harmful pathogens. This shift led to a notable reduction in serum endotoxin levels.
Area of Science:
- Pediatric Gastroenterology
- Microbiology
- Immunology
Background:
- Intestinal flora imbalance and endotoxemia are linked to various infant health issues.
- Potentially pathogenic microorganisms can increase endotoxin production, impacting infant health.
Purpose of the Study:
- To investigate the effect of probiotic administration on the intestinal flora ratio in infants.
- To determine if probiotics can reduce serum endotoxin levels by modulating gut microbiota.
Main Methods:
- A study involving nine infants with gastrointestinal conditions.
- Oral administration of a specific probiotic mixture (Streptococcus faecalis, Clostridium butyricum, Bacillus mesentericus) at 2 g/day for two weeks.
- Analysis of fecal bacterial cultures (aerobic and anaerobic) and serum endotoxin levels.
Main Results:
- Significant increase in anaerobic bacteria, including Bifidobacterium, in fecal cultures.
- A five-fold increase in the ratio of anaerobic to aerobic bacteria.
- A significant decrease in serum endotoxin levels was observed.
Conclusions:
- Probiotics effectively modulate infant intestinal flora, promoting anaerobic bacteria growth.
- The observed decrease in serum endotoxin suggests reduced endotoxin translocation.
- Probiotic intervention may be a strategy to mitigate risks associated with pathogenic microorganisms in infants.
Purpose:
The aim of this study was to examine whether administration of probiotics to infants can change the ratio of intestinal flora and thereby decrease serum endotoxin produced by potentially pathogenic microorganisms.
Methods:
Nine infants including five with of biliary atresia, two with omphalocele, one each with Hirschsprung's disease and imperforate anus were studied. All patients were stable, and no antibiotics were given during this study. A probiotic mixture consisting of Streptococcus faecalis, Clostridium butyricum and Bacillus mesentericus was administered orally to each infant at 2 g/day for 2 weeks. Fecal aerobic and anaerobic bacterial cultures, serum endotoxin level, and other biochemical parameters were examined.
Results:
In fecal cultures, anaerobic bacteria including Bifidobacterium increased significantly whereas Escherichia coli, Streptococcus, and Klebsiella tended to decrease. The ratio of anaerobic to aerobic bacteria increased five times as a result of administration of probiotics, and serum endotoxin levels decreased.
Conclusions:
Probiotics affect intestinal bacterial flora by increasing anaerobic bacteria and decreasing the population of potentially pathogenic microorganisms. A decrease in luminal endotoxin may result in less endotoxin translocation or bacterial translocation.
Related Concept Videos
Probiotics
Development of Human Microbiota
Development of the Oral Microbiota
Dysbiosis of the Gut Microbiota
Microbiota Modulation by Antibiotics

