There should be no exemptions for vaccination except for the rare cases where a child has a legitimate, documentable adverse health reaction to the vaccine, which is known to occur in very rare cases. I'm not a fan of religious exemptions, but I suppose those are probably unavoidable in some cases too (the Amish would be a particular example)--I would hate for it to become like other issues, where religious freedom can be so widely defined that anyone could fit the criteria. If people are going to apply for an exemption from vaccination for their kids, it should be a bureaucratic pain in the ass: people with real and legitimate objections won't mind the paperwork and people who are just mindlessly following a fad will be prevented from opting out just by checking one box.
http://www.theguardian.com/us-news/2015/apr/13/rob
http://www.theguardian.com/us-news/2015/apr/13/rob