(a) Serum cytokine levels in patients with acute phase of KD, age-matched patients with bacterial infection, age-matched healthy children, and healthy adults. (b) The effect of pooled human immunoglobulin (PHIG) therapy on serum cytokine levels of KD patients. Serum cytokine levels of KD patients were compared at the acute phase, just after PHIG therapy, and at the convalescent phase. NS, Not significant.