Serum concentration of IL-17F did not differ significantly between children with IBD (median: 15.11 pg/ml; range: 0.09–189.84 pg/ml; mean ± SD:19.26 ± 23.92 pg/ml) and controls (median: 11.56 pg/ml; range: 0.19–32.49 pg/ml; mean ± SD: 13.52 ± 8.50 pg/ml) (p = 0.33). Here, IL17F is linked to inflammatory bowel disease.