Thanks, the first study I linked had only looked at 26 states. This is still a very small number considering the total number of likely cases of COVID in the <18 demographic.

Thanks, so the chance is roughly 500/5,000,000 among individuals with a positive covid test.

MIS-C only affects children so the denominator is less than 5,000,000. But your point still stands, it seems to be relatively rare.