We just had one of those fights up here in my state over whether or not parents have the right to prevent their children from being fully immunized in order to attend school.
Up until 2019 parents were able to deny immunization based on philosophical, medical, or religious reasons but the 2019 Legislature passed a bill removing the philosophical and religious beliefs leaving only the medical exemption. Those opposed to the new law gathered enough signatures to bring the issue to a referendum and the electorate voted overwhelmingly (3-1) to support the revised and current law.
There's been some 'noise' about appealing the results of the vote on Constitutional grounds but AFAIK nothing has come of it yet.