Some of the major components of egg are implicated in the Th response in schistosomiasis, including glycoprotein IPSE/α1, ω1 (19, 20), lacto-N-fucopentaose III (21), and S. mansoni-p40 (Sm-p40) (22), of which Sm-p40 is the most abundant egg component that can induce a strong Th1-polarized response (23). Here, IL9 is linked to schistosomiasis.