CD40LG and infection: At and following day 17 pi, at the liver and post-liver parasite stage, SmCB1 released from the juvenile worms elicited memory responses in SmCB1-immunized mice whereby serum IgM, IgG1, IgG2a, and IgG2b antibody binding to the immunogen were significantly (p < 0.05–p < 0.005) higher than infection control mice.