IL17A and chronic rhinosinusitis: Kim et al stratified 69 patients into mild, moderate, and severe ECRSwNP using the Japanese Epidemiological Survey of Refractory Eosinophilic Chronic Rhinosinusitis score, which considers clinical examination findings, CT results and eosinophil counts.59 They found that IL-17A and IFN-γ were decreased in severe ECRSwNP compared with mild ECRSwNP.