Fred Klonsky has said this today, but I'm going to say it, too.
The national teachers unions (and a few other unions as well) are wrong on vaccinations.
Randi Weingarten has said it should be locally negotiated:"In order for everyone to feel safe and welcome in their workplaces, vaccinations must be negotiated between employers and workers, not coerced," Weingarten said in a statement.
The NEA says that teachers should be given the option of weekly testing.
It's not clear why, exactly, the unions have taken this position. Certainly there are plenty of members who do not support mandatory vaccinations, but it's not like the nationals have been reluctant to take positions without worrying about internal opposition (for example, Common Core support and endorsing Hillary Clinton and too many years of test-centered accountability).
The cynical view among the anti-union crowd is that this is an attempt to negotiate... something.
Meanwhile, it seems entirely likely that it some districts, boards will resist mandatory anything at all. So the national position leaves concerned teachers hanging on their own in those districts.
It's true that some aspects of covid response will have to be worked out on the local level-- the only level at which people really know what's appropriate for that district and building. But some things are true everywhere.
Adults can be vaccinated. Children can not. Teachers already undergo mandatory vaccinations as well as mandatory background checks before they can enter a classroom. There's no reason not have mandatory covid vaccinations for the fall, and a regular covid check to go with it. I'm no fan of mandatory government stuff, but if a public health crisis that leaves children uniquely exposed doesn't qualify, I'm not sure what does.