Healthy mice that received the probiotic during 7 days (Lc group) and mice non-treated with L. casei CRL431, but challenged with Salmonella (infection control, S group) stimulated the production of TNFα and IFNγ by the immune cells of the Peyer's patches, compared to non-treated and non-infected mice (untreated control, C) (Table 1). This evidence concerns the gene TNF and infection.