then they have a regression. they start to lose skills. lose milestones. i've personally probably talked to over 1,000 parents where that regression took place immediately following a vaccine appointment. i think it's important for parents to understand, children are given 36 vaccines in the u.s. by the time they reach the age of 5. the mmr is only 2 of those 36 shots. typically the shots are given simultaneously. so an average child will get six vaccines in a single appointment. yet we don't have a single piece of research to understand the potential risk of all those vaccines at once. so when someone tries to tell me mmr alone doesn't cause autism but i take my child in for a vaccine appointment with 6 shots in 10 minutes, how am i supposed to feel reassured? >> i say this with overwhelming sympathy and -- for you and your son. but just listening to you, i've got to ask the question, there isn't a single study, and we've looked at all the science, that says there is any causal link between these vaccines and autism. i know you're saying --