FIGURE 6.

Antibacterial activity of the intestinal fluids throughout the lives of the animals. Twenty one, 28, 35, 42, 54, 61, and 180 days old mice were fed with conventional diet, L. casei CRL431 or L. paracasei CNCM-I 1518, for 7 and 5 days, respectively. At this time samples of intestinal fluids were taken and studied for their S. aureus antimicrobial activity after 2 h of incubation, by plate count agar. Results were expressed as the differences in the CFU/ml before and after the incubation of the bacteria with the intestinal fluids. Results expressed as CFU/ml (mean ± SEM) are representative of three independent experiments. The statistics differences were calculated with respect to the control group that received conventional diet ^∗p < 0.05, ^∗∗p < 0.01.