TNF and infection: After C50041ΔtrmE infection, there was a significant increase in the mRNA of TNF-α (p < 0.01) on day 1 and IL-1β (p < 0.001) on day 7, but the mRNA of IL-1β (p < 0.05) and IFN-γ (p < 0.05) was significantly reduced on day 4 compared to that of SE (C50041).