Recently Julie Gerberding, the head of the U.S. Centers for Disease Control and Prevention (CDC), appeared on Dr. Sanjay Gupta's show House Call and explained that vaccines can trigger autism in a vulnerable subset of children. This is the claim that many parents have been making since at least the 1980s, and they have been dismissed and even mocked for making it.

You, sir, are mistaken. And blatantly misinformed. And spreading your ignorance when you need to keep quiet.