IL4 and infection: As no distinct disease phenotype could be discerned in macrophage/neutrophil specific (LysMcreIL-4Rα−/lox) IL-4Rα−/− mice compared with IL-4Rα intact animals infected with L. mexicana, no IL-4/IL13 responsive non-T cell population can easily be ruled out in promoting early infection against this parasite.