I don't know how you qualify an intelligent "anti-vaxxer". I've had colleagues, that were otherwise intelligent people, vehemently refuse to listen to the evide

I don't know how you qualify an intelligent "anti-vaxxer". I've had colleagues, that were otherwise intelligent people, vehemently refuse to listen to the evidence. They let their fear of autism drive their decisions. In doing so, they opened their children, and the communities they live in, to measles, mumps, chicken pox, rubella... all of the things we'd nearly eliminated. Unless the child has allergies to the vaccine, or a compromised immune system, it isn't reasonable to leave the child without vaccination. Intelligent people have more complex ways of rationalizing the decisions they make based on fear. It doesn't make the decision intelligent or wise. Either way, better vaccines will be a boon to all. Hopefully, it will also ameliorate the fears of some "anti-vaxxers". My own fear is that because irrational decisions are already not based on evidence, these people will be unable to consider or accept new evidence, even when their specific rationalizations have been accounted for.