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Updated: Jun 28, 2026

Probiotic Studies in Neonatal Mice Using Gavage
Published on: January 27, 2019
Specific probiotics in reducing the risk of acute infections in infancy--a randomised, double-blind,
Samuli Rautava1, Seppo Salminen, Erika Isolauri
1Department of Paediatrics, University of Turku, Turku, Finland. samrau@utu.fi
Insights
Probiotics, including Lactobacillus rhamnosus GG and Bifidobacterium lactis Bb-12, significantly reduced infections in infants. Supplemented formula lowered risks of acute otitis media and recurrent respiratory infections, decreasing antibiotic use.
Area of Science:
- Pediatrics
- Microbiology
- Immunology
Background:
- Infant infections pose significant health challenges.
- Probiotics are increasingly explored for immune support in infants.
Purpose of the Study:
- To evaluate the efficacy of specific probiotics in reducing infection incidence in formula-fed infants.
Main Methods:
- A randomized, double-blind, placebo-controlled trial.
- Infants received formula with Lactobacillus rhamnosus GG and Bifidobacterium lactis Bb-12 or placebo until 12 months.
- Infection incidence, including acute otitis media and recurrent respiratory infections, was monitored.
Main Results:
- Probiotic group showed reduced acute otitis media (22% vs 50%) and antibiotic prescriptions (31% vs 60%).
- Recurrent respiratory infections were lower in the probiotic group (28% vs 55%).
- Statistically significant risk reductions were observed for these outcomes.
Conclusions:
- Probiotics L. rhamnosus GG and B. lactis Bb-12 appear safe and effective in lowering infection risks in infants.
- Findings suggest probiotics can decrease acute otitis media, antibiotic use, and recurrent respiratory infections.
- Further research is recommended to confirm these benefits.
Abstract:
A randomised, double-blind, placebo-controlled study was conducted to determine whether probiotics might be effective in reducing the risk of infections in infancy. Infants requiring formula before the age of 2 months were recruited from community well-baby clinics. Infant formula supplemented with the probiotics Lactobacillus rhamnosus GG and Bifidobacterium lactis Bb-12 or placebo was administered daily until the age of 12 months. Incidence of early infections (before the age of 7 months) and incidence of recurrent (three or more) infections during the first year of life were recorded as the main outcome measures of the study. During the first 7 months of life, seven out of thirty-two (22 %) infants receiving probiotics and twenty out of forty (50 %) infants receiving placebo experienced acute otitis media (risk ratio (RR) 0.44 (95 % CI 0.21, 0.90); P = 0.014) and antibiotics were prescribed for ten out of thirty-two (31 %) infants receiving probiotics and twenty-four out of forty (60 %) infants receiving placebo (RR 0.52 (95 % CI 0.29, 0.92); P = 0.015). During the first year of life, nine out of thirty-two (28 %) infants receiving probiotics and twenty-two out of forty (55 %) infants receiving placebo encountered recurrent respiratory infections (RR 0.51 (95 % CI 0.27, 0.95); P = 0.022). These data suggest that probiotics may offer a safe means of reducing the risk of early acute otitis media and antibiotic use and the risk of recurrent respiratory infections during the first year of life. Further clinical trials are warranted.
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