654: TIMING OF MULTISYSTEM INFLAMMATORY SYNDROME IN CHILDREN IN RELATION TO INDEX COVID-19 INFECTION.

Relationship Between Spike IgG and Timeframe of MIS-C (r=0.61), Peak Ferritin and Anakinra (r=0.63), and Peak Ferritin and Timeframe of MIS-C (r=0.34). B Conclusions: b The Timing of MIS-C Diagnosis in Relation to the Index of COVID-19 Infection does Vary by Variant with a 6.9 Day Increase in Average Since the Start of the Pandemic. COVID-19 Variant Timeframes Were Defined by Dominant (>50% cases) Strand in the United States (Alpha/Beta/Gamma 1/21/20-6/25/21, Delta 6/26/21-12/17/21, and Omicron 12/18/21-Present). [Extracted from the article]