This is absolutely horrible. These vaccines need to be absolutely mandatory - no religious exemptions, no exemptions because they're not "organic" or you read somewhere that all you need to do is think positive thoughts and eat carrots... Your right to self-actualization ends when you put other people's lives at risk.
This reminds me that I should check up on my immunization status. I got all the shots when I was a kid, but I'm not sure if the measles vaccination is permanent or needs a booster - and I'll be flying on LY next month with god only knows whom, so ...