It should be up to the parents of whether their child is vaccinated or not.  Just because a child is unvaccinated-it does not mean that child will get covid and pass it on to the class. A vaccinated person (in this case child) can still become infected and have the potential to spread the virus to others, "although at much lower rates than unvaccinated people".  If this is the case, why should parents who don't want their children to have the vaccine be forced to do so.  It doesn't prevent the viral infection and the risks of SARS-CoV-2 infection in fully vaccinated people are higher where community transmission o the virus is widespread.  As stated in the beginning, it should be the parent's choice and not a forced choice for something that seems unnecessary.