IL1B and infection: Figure 1E,F show that the concentrations of IL-1β and TNF in jejunum homogenate were significantly higher than that in the CK group, which was in agreement with the results of mRNA expression levels of IL-1β and TNF in the jejunum (Figure 1G). These results confirm that infection of this L. monocytogenes strain could lead to serious pathological changes in mice.