IL17A and congenital rubella syndrome: Although early studies did not find an increase in IL-17 production in CRS (Van Bruaene et al., 2008; Cao et al., 2009) two more recent studies in the adult Chinese population have reported increased IL-17 in eosinophilic CRSwNP, suggesting a possible role of Th17 cells in this inflammatory condition (Cao et al., 2009; Wei et al., 2014).