You know what, It’s something I’ve been reading and seeing a lot but I don’t know that I’ve seen a study. I found this WaPo article where a doctor says, “cases have jumped for kids,” but I don’t see data to back that up. My state does not report new cases by age group—only overall age group distribution. So I would have to track that daily or weekly to know if it’s changed.
https://www.washingtonpost.com/lifestyle/2021/07/22/covid-delta-variant-children/