Autism and vaccines: It's the link that just won't die. The American Academy of Pediatrics, the CDC, the World Health Organization, and the Institute of Medicine all agree that there's probably no relationship between autism and vaccines. But if the case is that solid, why do so many people remain unconvinced, from actress Jenny McCarthy, who went on Oprah to say she believes that a vaccination caused her son's autism and wrote a book about it, to Sen. John McCain, who, at a campaign event earlier this year, said he thought there was "pretty strong evidence" that some vaccines cause autism. Their beliefs may have been validated in March when federal officials said that a Georgia girl was entitled to compensation because vaccines may have aggravated an underlying condition, causing autism-like symptoms. And researchers at the National Institute of Mental Health (NIMH) said in March that they are still taking a careful look into parent concerns that vaccines are tied to the disorder.