i can't seem to find it in my notes right now. i came across the study when looking into the increase of kawasaki syndrome post "asymptomatic" covid infections in children last year. i do have this paper in my notes that speaks of a 30 fold increase in kawasaki diagnoses: https://www.nature.com/articles/s41591-020-0959-4

since then, we now call this post-covid complication MIS-C and there's increasing coverage and study into it. i do recall coming across another study looking at a more broad range of age groups and noting a 20 fold increase of cardiovascular diagnoses.

overall, we still have a lot to learn about this virus.