(But I've also heard the transmission rate from children to teachers has been pretty low, but how low?)
There's already a long list of required vaccinations for school... is this one any different?
https://natomasunified.org/immunization-requirements-for-2021-2022-school-year
Was the banning of beaches back when we all were hand sanitizing and wiping down our amazon packages and groceries when no one really understood the transmission mechanism? Now we know it is mostly airborne and rare to catch outside with enough distance.