FCGR1A and systemic-onset juvenile idiopathic arthritis: Up-regulation of BRGs was observed in Kawasaki disease (KD) and systemic juvenile idiopathic arthritis (sJIA) with notable exception of FCGR1A and FCGR1B. Considering all 20 discovery datasets, FCGR1A and FCGR1B seemed to be robust makers for respiratory tract infections, including both viral and bacterial infections.