Individual expression of two interferon-related genes and Pap in the colon mucosa at different time points after Salmonella infection or control treatment. Genes expression is quantified by Q-PCR, using Rps26 as reference gene (using Arf1 as reference gene showed similar results; data not shown). Each dot represents an individual rat. Dotted line indicate lowest mRNA standard. Medians are presented by a black line. The median value of the uninfected group was set at 1.0. Y-axis is at log10 scale. * p < 0.05, **p < 0.01, ***p < 0.001.