Salmonella cell counts determined in test reactors during treatment periods 24. Treatment periods 24 were used to test the effect of prebiotics (FOS, GOS) or RBL67 or combinations of RBL67 with FOS, GOS or MOS on Salmonella N-15 colonization. RBL67 and/or prebiotics were added to TRs at 108 CN/mL and 5.2 g/day, respectively during a 2 days prevention period and for 5 days after N-15 challenge. N-15 was inoculated once at 106 cfu/mL and was monitored by plate counts on CHROMAgar Salmonella. (?) Salmonella detection limit of 4.1 cfu/mL. Cell counts at day 0 correspond to the inoculum added to the reactors.