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Background  Probiotics and prebiotics are promising strategies to counteract  Salmonella  prevalence in swine. In the present study, we investigated the effects of prebiotics (fructo- (FOS), galacto- (GOS) and mannan- (MOS) oligosaccharides) and the bacteriocinogenic  Bifidobacterium thermophilum  RBL67 (RBL67) on  Salmonella enterica  subsp.  enterica  serovar Typhimurium N-15 (N-15) colonization using the PolyFermS  in vitro  continuous fermentation model simulating the swine proximal colon.    Material and methods  The PolyFermS model was designed with a first-stage reactor containing immobilized fecal pig microbiota. This reactor continuously inoculated five parallel second-stage reactors, a control and four treatment reactors, all operated with proximal colon conditions. FOS and GOS (5.2 g/day), and MOS (half dosage) and RBL67 (10 8  copy numbers/mL applied daily) were tested on the ability of N-15 to colonize reactors, inoculated with the same microbiota. Reactor effluents were collected daily and analyzed for microbial composition (quantitative PCR and 454 pyrosequencing of 16S rRNA gene pool) and main metabolites (HPLC).    Results  RBL67 and N-15 were shown to stably colonize the system. Colonization of N-15 was strongly inhibited by FOS and GOS, whereas addition of RBL67 alone or combined with MOS showed intermediate results. However, the effect of FOS and GOS was enhanced when prebiotics were combined with a daily addition of RBL67. FOS and GOS increased the total short chain fatty acid production, especially acetate and propionate. RBL67 combined with FOS additionally stimulated butyrate production.    Conclusions  Our study demonstrates the suitability of the porcine PolyFermS  in vitro  model to study nutritional effects of pro- and prebiotics on gut microbiota composition and activity. It can further be used to monitor  Salmonella  colonization. The inhibition effects of FOS and GOS on N-15 colonization are partly due to an increased acetate production, while further antimicrobial mechanisms may contribute to an enhanced inhibition with prebiotic-RBL67 combinations. A future direction of this work could be to understand the anti- Salmonella  effects of  Bifidobacterium thermophilum  RBL67 in the presence of prebiotics to unravel the mechanism of this probiotic:pathogen interaction.    Electronic supplementary material  The online version of this article (doi:10.1186/s13099-014-0044-y) contains supplementary material, which is available to authorized users.

gut pathogens

Synergistic effects of Bifidobacterium thermophilum RBL67 and selected prebiotics on inhibition of Salmonella colonization in the swine proximal colon PolyFermS model