For example, IL-33 and TSLP promote both the development of a wound healing phenotype in dermal APCs and Th2 polarisation in skin-draining lymph nodes (Cook et al., 2011; Gause et al., 2013), whilst CCL20 is a chemoattractant for CCR6+ T cells and immature DCs in murine models of psoriasis (Harper et al., 2009), and thus may be involved in driving these processes following exposure to cercariae. This evidence concerns the gene CCL20 and psoriasis.