This has nothing to do with immigrants, that's a strawman. Every outbreak so far can be traced back directly to ignorant, selfish middle and upper middle class parents who refuse to vaccinate their children because they saw something on some wackjob website on the internet or heard something Jenny McCarthy said on TV. Since they aren't poor, they've deluded themselves into thinking they're smarter than they are so they ignore their children's doctors, pretending they know better when they don't. Unvaccinated children should never be allowed in school. The only exceptions should be children who cannot take them due to an allergy or pre-existing medical condition. Exemptions based on a child's parent being a selfish idiot who places their own opinions above their children's health should no longer be allowed. We don't let parents refuse to take sick children to the doctor and we shouldn't allow them to let their children and all the other children in their community get sick with easily preventable diseases.