TLR2 and infection: Our results showed a significant increase of TLR2 (+) cells in the small intestine of healthy mice that received L. casei CRL 431 compared to the untreated control (Figure 3A) and significant increases were also observed, only for 7 days post infection, in the mice given continuously the probiotic bacteria (Lc-S-Lc group) compared to the infection control (S group).