Warbler said:

but what if all doctors refuse to give treatment to unvaccinated kids? Also what right does a doctor have to refuse to treat a patient? Under just what grounds can a doctor refuse to treat a patient. If a doctor has the right to decide not to treat whatever patient he/she doesn't want to treat, what is to stop a doctor from not treating a patient cause he/she doesn't like the patient's skin color or religion or sexual preference?

I believe there are extensive rules about under what conditions a doctor can refuse to see a patient. Much of it falls under the same laws that dictate that a restaurant owner can't keep all the colored folk out.

If I hire a mechanic and he doesn't fix my car because I'm in a biracial marriage, he's violating those rules.

If I hire a mechanic and he doesn't fix my car because I insist he not use a wrench and work in the dark while doing so, that's a different case legally.

Ethically, the American Academy of Pediatrics has decided it's ethical to dismiss a patient who refuses to vaccinate their child. Obviously this can be argued, but they are a governing body on these matters.