IL4 and schistosomiasis: Although eosinophils are not necessary for granuloma formation or liver fibrosis in mice following schistosome infection,19 they are not only a prominent granulomatous component but also an important source of IL‐4 to maintain the Th2 responses,5, 7 which supports eosinophils have a redundant but important role in granuloma formation in schistosomiasis.