Changes in cytokine expression in response to infection by Campylobacter at 20 da in TLG2 birds was characterized in the ileum tissues (Fig. 3) by a significant (p < 0.05) increase in most of the cytokine expression at 15 dpi compared to uninfected TLG1 birds, with the exception of IFN-γ and IL-1β. The gene discussed is IFNG; the disease is infection.