The current pathogenesis of Kawasaki disease is not yet clear, but one of its main pathological changes is a systemic vasculitis. During an outbreak of Kawasaki disease, the blood viscosity increases primarily due to platelet aggregation. Typically, oral aspirin is administered to prevent this inflammation and to treat platelet aggregation. The dosage is generally reduced gradually once the fever subsides, with maintenance doses lasting about six to eight weeks. If coronary artery lesions are present, the duration of medication is extended until the coronary arteries return to normal before discontinuing the drug.