Associations were also observed between persistent oligoarticular JIA and rs224225 in MEFV (Puncorr = 0.022) and rs224217 in MEFV (Puncorr = 0.031), between extended oligoarticular JIA and rs224217 in MEFV (Puncorr = 0.047), and between RF-negative polyarticular JIA and rs224215 in MEFV (Puncorr = 0.009). Here, MEFV is linked to polyarticular juvenile idiopathic arthritis.