Desirous of Change, as Tameria said, small children and babies, who are too young to be vaccinated, are still susceptible to the measles virus, as well as others. Also, just because you've been vaccinated does not mean you can't contract measles, although it's a pretty small chance.
Tameria, yes, I've read about the Autism link to vaccinations being debunked, but that doesn't keep parents from still using it as an excuse, and some are still truly afraid of it. I had my children vaccinated, but I understand parents being concerned about possible side effects. I just dont get parents who are too lazy to get their kid vaccinated, but that's what I think happens when generations are fortunate enough not to grow up in a world where millions were dying from it, and every parent was worried. How easily people take for granted, and forget.