In Who’s Afraid Of The Truth About Autism, Jenny McCarthy claims:
How do you say vaccines don’t cause autism when only a single vaccine — MMR — has ever been looked at for its relationship to autism? What about the other 10 vaccines our children receive through 36 doses? If Viagra is considered safe, is Vioxx then safe too, or do you need to test both?
They have. All vaccines—all drugs, as a matter of fact—must go through a rigorous process of testing before approval. They must go through 7 stages of clinical trials before being used on the general public.