A Comparison of Two Probiotic Strains of Bifidobacteria in Premature Infants

Published:September 03, 2013DOI:https://doi.org/10.1016/j.jpeds.2013.07.017

      Objective

      To determine the impact of 2 probiotic bifidobacteria on the fecal microbiota of premature infants fed either human milk or formula.

      Study design

      In the first of two phase 1 clinical trials, 12 premature infants receiving formula feedings were assigned randomly to receive either Bifidobacterium longum ssp infantis or Bifidobacterium animalis ssp lactis in increasing doses during a 5-week period. In the second, 9 premature infants receiving their mother's milk received each of the two bifidobacteria for 2 weeks separated by a 1-week washout period. Serial stool specimens from each infant were analyzed by terminal restriction fragment-length polymorphism and quantitative polymerase chain reaction for bacterial composition.

      Results

      Among the formula-fed infants, there was a greater increase in fecal bifidobacteria among infants receiving B infantis (Binf) than those receiving B lactis (Blac). This difference was most marked at a dose of 1.4 × 10 9 colony-forming units twice daily ( P < .05). Bacterial diversity improved over dose/time in those infants receiving Binf. Among the human milk-fed infants, greater increases in fecal bifidobacteria and decreases in γ- Proteobacteria followed the administration of Binf than Blac. The B longum group (which includes Binf but not Blac) was the dominant bifidobacteria among the human milk-fed infants, regardless of the probiotic administered.

      Conclusions

      Binf was more effective at colonizing the fecal microbiota than Blac in both formula-fed and human milk-fed premature infants. The combination of human milk plus Binf resulted in the greatest fecal levels of bifidobacteria.
      Bac-TRFLP ( Bacilli-specific terminal restriction fragment-length polymorphism), Bif-TRFLP ( Bifidobacteria-specific terminal restriction fragment-length polymorphism), Binf ( B infantis), Blac ( B lactis), cfu ( Colony-forming units), F+Binf ( Formula plus Binf), F+Blac ( Formula plus Blac), H+Binf ( Human milk plus Binf), H+Blac ( Human milk plus Blac), HMO ( Human milk oligosaccharides), NEC ( Necrotizing enterocolitis), PBS ( Phosphate-buffered saline), PCoA ( Principal coordinate analysis), qPCR ( Quantitative polymerase chain reaction), rRNA ( Ribosomal RNA), TRFLP ( Terminal restriction fragment-length polymorphism), UC Davis ( University of California, Davis), WO ( Washout)
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