Severe coronavirus disease 2019 (COVID-19) has been reported rarely in children. 1,2 International data suggest the development of a proinflammatory syndrome with features of Kawasaki disease (KD) or toxic shock syndrome (TSS) in children, possibly related to COVID-19.

; for the Columbia Pediatric COVID-19 Management Group IMPORTANCE Descriptions of the coronavirus disease 2019 (COVID-19) experience in pediatrics will help inform clinical practices and infection prevention and control for pediatric facilities. OBJECTIVE To describe the epidemiology, clinical, and laboratory features of patients with COVID-19 hospitalized at a children's hospital and to compare these parameters between patients hospitalized with and without severe disease. DESIGN, SETTING, AND PARTICIPANTS This retrospective review of electronic medical records from a tertiary care academically affiliated children's hospital in New York City, New York, included hospitalized children and adolescents (Յ21 years) who were tested based on suspicion for COVID-19 between March 1 to April 15, 2020, and had positive results for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). EXPOSURES Detection of SARS-CoV-2 from a nasopharyngeal specimen using a reverse transcription-polymerase chain reaction assay. MAIN OUTCOMES AND MEASURES Severe disease as defined by the requirement for mechanical ventilation. RESULTS Among 50 patients, 27 (54%) were boys and 25 (50%) were Hispanic. The median days from onset of symptoms to admission was 2 days (interquartile range, 1-5 days). Most patients (40 [80%]) had fever or respiratory symptoms (32 [64%]), but 3 patients (6%) with only gastrointestinal tract presentations were identified. Obesity (11 [22%]) was the most prevalent comorbidity. Respiratory support was required for 16 patients (32%), including 9 patients (18%) who required mechanical ventilation. One patient (2%) died. None of 14 infants and 1 of 8 immunocompromised patients had severe disease. Obesity was significantly associated with mechanical ventilation in children 2 years or older (6 of 9 [67%] vs 5 of 25 [20%]; P = .03). Lymphopenia was commonly observed at admission (36 [72%]) but did not differ significantly between those with and without severe disease. Those with severe disease had significantly higher C-reactive protein (median, 8.978 mg/dL [to convert to milligrams per liter, multiply by 10] vs 0.64 mg/dL) and procalcitonin levels (median, 0.31 ng/mL vs 0.17 ng/mL) at admission (P< .001), as well as elevated peak interleukin 6, ferritin, and D-dimer levels during hospitalization. Hydroxychloroquine was administered to 15 patients (30%) but could not be completed for 3. Prolonged test positivity (maximum of 27 days) was observed in 4 patients (8%). CONCLUSIONS AND RELEVANCE In this case series study of children and adolescents hospitalized with COVID-19, the disease had diverse manifestations. Infants and immunocompromised patients were not at increased risk of severe disease. Obesity was significantly associated with disease severity. Elevated inflammatory markers were seen in those with severe disease.

U ntil recently, the clinical course of coronavirus disease 2019 (COVID-19) in children has been reported to be largely mild. 1,2 Recently, it has become evident that a subset of children exposed to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) can become critically ill with a condition now referred to as multisystem inflammatory syndrome in children (MIS-C), characterized by systemic hyperinflammation with fever and multisystem organ dysfunction. 3 Gastrointestinal symptoms are increasingly recognized to be associated with the presentation of MIS-C, potentially confusing the diagnosis of MIS-C with other common, less toxic gastrointestinal infections and even inflammatory bowel disease. In the first published correspondence describing MIS-C in 8 patients from the United Kingdom, 100% presented with gastrointestinal (GI) symptoms. 4 Similarly, 6 of 10 patients from an Italian cohort had GI issues. 5 This is in contrast to adults, who most commonly present with respiratory symptoms and report GI symptoms in <10%-15% of cases. 6,7 We examined whether similar presentations and prevalence extended to our comparatively larger US cohort of 44 patients (<21 years old) with MIS-C.