Yes. Rates of flu went WAY down in schools last year. (This is in schools where mask and hand sanitizers were the norm) Far fewer absences.

Now I will say that in Dec 2019/Jan 2020 there was a nasty flu going around and a school I work for implemented masks and hand washing/sanitizer regimens. This was before we ever heard of Covid. But for the first time EVER, I didn't get sick, and neither did most students. It was eye-opening. Covid hit just a few months later and we were already totally used to masks and hand washing and so on by then.

People in general but kids in particular now know how to wash hands properly and regularly. School absence rates are lower than expected even now.