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Updated: Apr 19, 2026

Probiotic Studies in Neonatal Mice Using Gavage
Published on: January 27, 2019
Comparison of stool colonization in premature infants by three dose regimes of a probiotic combination: a randomized
Sourabh Dutta1, Pallab Ray2, Anil Narang1
1Division of Neonatology, Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
Insights
High-dose and standard-dose probiotics achieved similar stool colonization in premature infants. Both probiotic regimens effectively colonized infants compared to placebo, with no significant differences between the doses tested.
Area of Science:
- Neonatal Medicine
- Microbiology
- Clinical Trials
Background:
- Premature infants are vulnerable to gut dysbiosis.
- Probiotics are explored to improve gut health in neonates.
Purpose of the Study:
- To compare stool colonization rates in premature infants receiving high-dose versus standard-dose probiotics.
Main Methods:
- Blinded, randomized, placebo-controlled trial in a Level III neonatal unit.
- 149 infants (gestational age 27-33 weeks) received varying probiotic doses or placebo for 14-21 days.
- Stool colonization by probiotic organisms was assessed at 28 days.
Main Results:
- Significant colonization with Lactobacillus and Bifidobacterium in all probiotic groups compared to placebo.
- No significant difference in colonization rates between high-dose and standard-dose probiotic groups.
- Trends suggested higher colony-forming units with higher doses, but this was not statistically significant.
Conclusions:
- Proportion of infants colonized was similar across different probiotic dosing strategies.
- Both high-dose and standard-dose probiotic regimens are effective for gut colonization in premature infants.
Objective:
To compare stool colonization among premature infants receiving high-dose probiotics versus standard dose.
Study Design:
This blinded, randomized, placebo-controlled trial was conducted in a Level III neonatal unit. Eligibility criteria were gestational age 27-33 weeks, age < 96 hours, tolerating milk ≥ 15 mL/kg/day and availability for follow-up. Gastro-intestinal/life-threatening malformations and necrotizing enterocolitis/sepsis were exclusions. A total of 149 subjects were randomly allocated to groups A through D (received 12-hourly probiotic supplements of 10(10) cells for 21 days, 10(10) cells for 14 days, 10(9) cells for 21 days and placebo, respectively). Key outcome was stool colonization by a probiotic organism at 28 days.
Results:
Colonization with Lactobacillus and Bifidobacterium was significantly higher in groups A, B, and C versus placebo respectively, but groups A through C did not differ from each other. There were trends toward more colony forming unit (cfu) of Lactobacillus and Bifidobacterium per milliliter of stool in group A versus B and B versus C. Groups A and B and spontaneous preterm labor (SPL) independently predicted high Lactobacillus counts on day 28; groups A, B, and C and SPL predicted high Bifidobacterium counts.
Conclusion:
Proportion of infants colonized with probiotic species was similar with high-dose and standard dose regimes.
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