Objective: Multisystem inflammatory syndrome in children (MIS-C) is a rare yet serious pathological consequence of SARS-CoV-2 infection which is reported 4-12 weeks after the onset of COVID-19 in children and adolescents. The most common hyper-inflammatory conditions mimicking the clinical presentation of MIS-C include Kawasaki disease and toxic shock syndrome. The surveillance criteria of MIS-C were recently revised by US Center for Disease Control and Prevention to improve diagnostic precision. Although previous studies have shown that SARS-CoV-2 antibody titers correlate with COVID-19 severity, their relation to MIS-C severity remains poorly understood and the aim of the study was to investigate this.
Methods: As all the MIS-C patients get a SARS-CoV-2 antibody test performed on the first day of hospitalization, here we attempted to stratify risk for adverse outcomes due to MIS-C based on the SARS-CoV-2 antibody titers.
Results: Our studies demonstrated that SARS-CoV-2 antibody titers, specifically Total (IgG/IgM/partial IgA), Nucleocapsid IgG, and Spike IgM, do not correlate with MIS-C severity assessed based on the ICU admission, inotropic support, and mechanical respiratory support requirements.
Conclusion: Therefore, it might not be appropriate to predict the clinical course of patients presenting with MISC based on quantitative serology testing.
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