IL5 and infection: However, as mentioned above, Robinson et al. (1995) showed that BALB/c high and C57BL/10 and B10.BR low-responder mice were all protected against T. muris challenge infection when immunized s.c. with T. muris adult worm extract, with elevated serum IgG1 and IFN-γ and IL-5 cytokine profiles.