IFNγ−/− mice had a similar C. rodentium burden to that of the WT mice at day 10 post infection (mean ± SEM: Log 6,5 ± 0,2 CFU/g feces for IFNγ−/− and Log 6,6 ± 0,3 CFU/g feces for WT, n = 7) while at day 14 post infection the density was slightly higher in the IFNγ−/− mice (P < 0.05, Log 4,8 ± 0,3 CFU/g feces) than in the WT (mean Log 3,4 ± 0,3 CFU/g feces) mice. This evidence concerns the gene IFNG and infection.