RFK Jr. has claimed measles can be treated with vitamin A and that severe infection is linked to poor diet. But many experts who spoke with ABC News disagreed.

Offit: People aren't going to be making a good choice for themselves if they hear Robert F. Kennedy Jr. say, falsely, that measles vaccine causes deaths. It doesn't cause deaths, but it is a live attenuated or weakened virus, and so here's what it can cause.