Levels of splenic IFN-γ, IL-4, IL-5, IL-13 and IL-10 in C57BL/6 mice infected with 100 (A) or 200 (B) S. japonicum cercariae. Splenocytes were isolated from mice on day 56 post-S. japonicum infection and cultured to measure indicated cytokine levels using ELISA. Bars represent mean values ± SD. n = 5-6 mice per group. Results are representative of three independent experiments.