A 10-year-old previously healthy boy presented to the emergency department with 6 days of persistent fever; 4 days of abdominal pain, emesis and diarrhea; and bilateral nonpurulent conjunctivitis and red cracked lips. Four weeks before presentation, the patient had had 3 days of headache with no respiratory symptoms, and he and his family had tested positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on nasopharyngeal swab. On arrival at the emergency department, his blood pressure was 74/35 mm Hg and heart rate was 130 beats/min despite 60 mL/kg of fluid resuscitation. He was cool and had poor perfusion. He received inotrope support and empiric antibiotics and was transferred to the intensive care unit (ICU). Laboratory results on admission (Table 1) were clinically significant for leukocytosis, neutrophilia, lymphopenia, thrombocytopenia, elevated C-reactive protein (CRP), hyperferritinemia, hyponatremia, hypoalbuminemia, hypertriglyceridemia, acute kidney injury, transaminitis, coagulopathy, and markedly elevated troponin and N-terminal-pro-brain natriuretic peptide (NT-proBNP). Electrocardiography (ECG) showed conduction abnormality and an echocardiogram showed signs of myocarditis with no coronary artery changes or aneurysms. The patient's result for a nasopharyngeal swab for SARS-CoV-2 was negative on polymerase chain reaction (PCR) testing, but the result for serology testing was positive. We diagnosed pediatric inflammatory multisystem syndrome characterized by features of Kawasaki disease, cardiogenic shock, myocarditis, liver dysfunction, acute kidney injury and evolving macrophage activation syndrome. On admission to hospital, we provided the patient with concurrent treatment with intravenous pulse methylprednisolone (30 mg/kg/d) for 4 days, followed by a slow taper, and a dose of intravenous immunoglobulin (IVIG; 2 g/kg). Inotrope support was stopped by the fourth day after admission (DAA 4). Because of persistent fever and cytopenias, we added anakinra, a recombinant interleukin (IL)-1 receptor antagonist, at 100 mg/d (about 2.75 mg/kg/d) on DAA 7. His fever resolved on the same day. We started treatment with low-dose acetylsalicylic acid (antiplatelet dose of 3-5 mg/kg/d) when the patient's platelet count recovered by DAA 9. His renal function and troponin levels returned to normal on DAA 3 and 8, respectively. On DAA 10, clinical and biochemical