IL4 and infection: Upon investigation of the early production of IL-4 in the ear after 2 weeks of infection with L. major LV39, we found no significant change in KRT14cre IL-4Rα−/lox BALB/c mice compared to results for littermate control IL-4Rα−/lox BALB/c mice, while resistant C57BL/6 mice appeared to have significantly lower production of IL-4.