A 13-year-old boy was hospitalized for having persistent fever for ten days, with the highest temperature of 39.2°C. He also showed the following symptoms: Rashes Non-exudative conjunctivitis Cervical lymphadenopathy Knee and ankle arthralgia Tachycardia – 157 beats/min Erythema on the face He had no symptoms of chills, cough, vomiting, abdominal pain, diarrhea, and convulsions. Initial blood routine examination WBC – 3.8 x 109/L Neutrophils – 77.7% Hemoglobin – 94 g/L Blood platelet – 322 x 109/L C-reactive protein – 82 mg/L Erythrocyte sedimentation rate – 129 mm/h Radiological investigations Radiographs of knees, ankles, and hands were normal.

An echocardiogram indicated coronary artery dilation (LCA - 5.4 mm and RCA - 6.9 mm) & aortic regurgitation. Conventional angiography indicated coronary arteritis. Other laboratory findings Coomb’s Test – Positive Blood culture – Negative Urine…