Why are US teachers unions reluctant towards children returning to class?

Name: Why are US teachers unions reluctant towards children returning to class?
Uploaded: 2021-04-08T10:09:57Z
Duration: 3 min 28 s
Description: CDC report says nearly 80 percent of teachers, school staff have received at least 1 coronavirus vaccine dose nationwide.

CDC report says nearly 80 percent of teachers, school staff have received at least 1 coronavirus vaccine dose nationwide.