IL4 and infection: In previous studies, similar results were observed determining the mRNA cytokine expression of proinflammatory cytokines in stimulated PBMCs in which the expression of the cytokines IL-10 and IL-4 was not detected, but IFN-ɤ was observed two weeks post-infection with 3x103 tissue cysts of the type II IPB-G isolate (41, 42).