CD4 and infection: On day 30 post-infection, we found no significant difference in the amount of IFN-γ [ng/ml] produced by antigen-stimulated splenocytes from any group of mice, WT controls (0.207 ± 0.030), CD4+ T cell specific IL-4Rα deficient mice (0.331 ± 0.049), global IL-4Rα−/− mice (0.482 ± 0.076).