Now, when you get a viral infection, what normally happens is it takes days or weeks for your body to fight back at full strength, and that might be too late. When you're pre-immunized, what happens is you have forces in your body pre-trained to recognize and defeat specific foes. So that's really how vaccines work.

The risks are far greater to your child of not getting immunized than any kind of speculative potential relationship between the vaccine and the development of autism.