IL10 and infection: The levels of expressed mRNA for IL-10 in the cecum of infected chickens of E. tenella (positive control group) were significantly (P < 0.05) downregulated following primary (~ 0.47 at 6 DPPI) and secondary infection (~ 0.76 and 0.54-fold at 0 and 6 DPSI, respectively) when comparing to the non-infected chickens (NC group) (Fig. 30).