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Updated: May 4, 2026

Probiotic Studies in Neonatal Mice Using Gavage
Published on: January 27, 2019
Cohort study of probiotics in a North American neonatal intensive care unit
Annie Janvier1, Josianne Malo1, Keith J Barrington1
1Centre Hospitalier Universitaire Sainte Justine, Montréal, Quebec, Canada.
Insights
Routine probiotic administration significantly reduced necrotizing enterocolitis (NEC) in very preterm infants. This common probiotic intervention showed benefits without adverse effects on infection rates.
Area of Science:
- Neonatal Medicine
- Microbiology
- Gastroenterology
Background:
- Necrotizing enterocolitis (NEC) is a serious gastrointestinal complication in preterm infants.
- Probiotics have shown potential in preventing NEC, but evidence on specific formulations and routine use is ongoing.
Purpose of the Study:
- To evaluate the efficacy of routine probiotic administration in reducing NEC incidence in very preterm infants.
- To assess for any adverse consequences, such as increased healthcare-associated infections.
Main Methods:
- A probiotic mixture (Bifidobacteria and Lactobacillus rhamnosus) was administered daily to infants <32 weeks gestation.
- A comparison was made between infants receiving probiotics and a historical control group over two 17-month periods.
Main Results:
- Probiotic use was associated with a significant reduction in NEC incidence (9.8% to 5.4%, P < .02).
- A significant decrease was observed in the combined outcome of death or NEC (17% to 10.5%, P < .05).
- No significant effect on healthcare-associated infection rates was found.
Conclusions:
- Readily available probiotics, similar to those used in trials, substantially reduced NEC frequency in a neonatal intensive care unit.
- Routine probiotic administration is a viable strategy for preventing NEC in very preterm infants.
Objective:
To determine whether routine probiotic administration to very preterm infants would reduce the incidence of necrotizing enterocolitis (NEC) without adverse consequences.
Study Design:
Since the end of July 2011, we have administered a probiotic mixture to all admitted infants of <32 weeks' gestation. We give 0.5 g of a mixture of 4 bifidobacteria (Bifidobacterium breve, bifidum, infantis, and longum) and Lactobacillus rhamnosus HA-111 [corrected] (2 × 10(9) colony-forming units) per day, starting with the first feed, until the infant reaches 34 weeks. We compared complications among infants admitted during the first 17 months of routine use with those admitted during the previous 17 months.
Results:
Two hundred ninety-four infants received probiotics, and 317 infants formed the comparison group. Introduction of probiotics was associated with a reduction in NEC (from 9.8% to 5.4%, P < .02), a nonsignificant decrease in death (9.8% to 6.8%), and a significant reduction in the combined outcome of death or NEC (from 17% to 10.5%, P < .05). After adjustment for gestational age, intrauterine growth restriction, and sex, the improvements remained significant (OR for NEC, 0.51; 95% CI, 0.26-0.98; OR for death or NEC, 0.56; 95% CI, 0.33-0.93). There was no effect of probiotics on health care-associated infection.
Discussion:
A product that is readily available in North America, that has excellent quality control, and that contains strains similar to those that have been shown effective in randomized controlled trials substantially reduced the frequency of NEC in our neonatal intensive care unit.
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