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Multisystem inflammatory syndrome in children (MIS-C) occurs secondary to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. A retrospective study, involving 6 tertiary-care centers in Haryana, was conducted to evaluate the clinical features, severity, laboratory findings, and outcomes of patients with MIS-C. Disease severity was graded (mild/moderate/severe) and presence of cardiac abnormalities noted. Patients with and without cardiac abnormalities and with and without severe disease were compared. Forty-eight children with MIS-C were included (median age - 9.5 y). Fever (100%), gastrointestinal (83.3%) and mucocutaneous (50%) symptoms were common. Only 16.7% patients had previous history of documented SARS-CoV-2 infection/contact. Severe disease and cardiac abnormalities were seen in 47.9% and 54.2% patients, respectively. NT-proBNP > 1286.5 pg/mL and thrombocytopenia (≤ 119500/µL) were significant risk factors for severe MIS-C. Forty-five patients (93.8%) recovered and 3 died. Median hospitalization duration was 7 d (5–9.5). MIS-C must be considered as a possibility in any febrile child, even if a positive epidemiological history is absent. High NT-proBNP and thrombocytopenia are significant risk factors for severe MIS-C. (Trial Registration: The study was registered with the Clinical Trials Registry, India (CTRI/2021/09/036491)). Supplementary Information The online version contains supplementary material available at 10.1007/s12098-022-04328-4.

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A 4-year-old girl, a known case of juvenile idiopathic arthritis for 2 years presented to us with high-grade fever and abdominal distension for 2 months. On examination, her temperature was 104°F and she was found to be pale with bilateral cervical lymphadenopathy of up to 3×3 cm in size. Her liver was enlarged with a firm consistency and a span of 12 cm. Her spleen was enlarged up to 3 cm along its long axis. The rest of her systemic examination was normal. Laboratory investigations revealed leucocytosis, anaemia and thrombocytopenia with a mildly elevated erythrocyte sedimentation rate. Serum ferritin was 16 500 ng/dL and lactate dehydrogenase was 2311 U/L. A bone marrow aspirate showed macrophages showing ingested nuclei. She was diagnosed as having macrophage activation syndrome and was initiated on intravenous methylprednisolone 300 mg daily for 3 days and was switched over to oral prednisolone 2 mg/kg/day. She is currently doing well on follow-up.