title: Effects of probiotic or prebiotic supplemented milk formulas on fecal microbiota composition of infants.
abstract: The aim of the study was to evaluate whether supplementation of milk-formulas with prebiotic fructo-oligosaccharides or a probiotic, Lactobacillus johnsonii La1 (La1), could modulate the composition of the fecal microbiota of formula-fed infants, compared to breastfed (BF) infants. Ninety infants close to 4 months of age were randomized into one of three groups to be blindly assigned to receive for 13 weeks: a) an infant formula (Control), b) the same formula with fructo-oligosaccharides (Prebio), or c) with La1 (Probio). At the end of this period, all infants received the control formula for 2 additional weeks. Twenty-six infants, breastfed throughout the study, were recruited to form group BF. Fecal samples were obtained upon enrolment and after 7 and 15 weeks. Bacterial populations were assessed with classical culture techniques and fluorescent in situ hybridisation (FISH). Seventy-six infants completed the study. On enrolment, higher counts of Bifidobacterium and Lactobacillus and lower counts of enterobacteria were observed in BF compared to the formula-fed infants; these differences tended to disappear at weeks 7 and 15. No major differences for Clostridium, Bacteroides or Enterococcus were observed between the groups or along the follow up. Probio increased fecal Lactobacillus counts (p<0.001); 88% of the infants in this group excreted live La1 in their stools at week 7 but only 17% at week 15. Increased Bifidobacterium counts were observed at week 7 in the 3 formula groups, similar to BF infants. These results confirm the presence of higher counts of bifidobacteria and lactobacilli in the microbiota of BF infants compared to formula-fed infants before dietary diversification, and that La1 survives in the infant digestive tract.
authors.affiliation: Ultrastructure Laboratory, Institute of Nutrition and Food Technology (INTA),University of Chile, J.P. Alessandri 5540, Santiago, Chile. obrunser@inta.cl
authors.forename: Oscar
authors.initials: O
authors.lastname: Brunser
authors.forename: Guillermo
authors.initials: G
authors.lastname: Figueroa
authors.forename: Martin
authors.initials: M
authors.lastname: Gotteland
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Haschke-Becher
authors.forename: Corine
authors.initials: C
authors.lastname: Magliola
authors.forename: Florence
authors.initials: F
authors.lastname: Rochat
authors.forename: Sylvia
authors.initials: S
authors.lastname: Cruchet
authors.forename: Richard
authors.initials: R
authors.lastname: Palframan
authors.forename: Glenn
authors.initials: G
authors.lastname: Gibson
authors.forename: Francoise
authors.initials: F
authors.lastname: Chauffard
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Haschke
mesh_terms: D001644:Bifidobacterium; D001942:Breast Feeding; D015169:Colony Count, Microbial; D004755:Enterobacteriaceae; D005243:Feces / Q000382:microbiology*; D005260:Female; D006801:Humans; D041943:Infant Formula; D007231:Infant, Newborn; D007778:Lactobacillus; D008297:Male; D009844:Oligosaccharides / Q000008:administration & dosage*; D019936:Probiotics / Q000008:administration & dosage*; D011446:Prospective Studies
chemical_list: D009844:Oligosaccharides; C116580:fructooligosaccharide