IL4 and infection: The expression of IL-4 shows a gradual and significant increase during early stages of infection (4, 8 and 16 dpi) both in the primoinfected and reinfected groups with respect to the UC group similarly to the liver, while at 100 dpi only the primoinfected animals maintained the overexpression (P < 0.01) of this cytokine with respect to the UC ones.