MBFS declares grants from the US Centers for Disease Control and Prevention (CDC) and royalties from UpToDate for being an author on the section for MIS-C. AGR declares grants from the US National Institutes of Health (NIH) and US CDC to her institution; is the section editor of paediatric critical care medicine of UpToDate; honoraria for Grand Rounds presentation from St. Jude; honoraria from ThermoFisher; travel support from the International Sepsis Forum, Institut Merieux, and ThermoFisher; participation on data safety monitoring boards of the NIH Grace Study, REMAP-CAP, and NIH PREVENT-VILI; is on the medical advisory board of Families Fighting Flu; chairs the International Sepsis Forum; and has received reagents from Illumina.