Some wrongly believe that the MMR vaccine causes children to develop autism spectrum disorder, ASD. They cite a 1998 article appearing in The Lancet, a British medical journal, that alleged a link between the two. That study has since been shown to be fraudulent. In 2010 the journal declared the article to be "utterly false." After 22 studies, not a shred of evidence exists to correlate MMR vaccine with ASD. Anti-vaccination activist Jenny McCarthy's son was one of those few children who had seizures after being injected; her son's symptoms may have been misdiagnosed as ASD instead of Landau-Kleffner syndrome, a rare neurological disorder. Or he simply may have developed more slowly than normal. In any case, having a Hollywood celebrity using unfounded, discredited evidence to justify anti-vaccination positions is a dangerous thing. Every parent who fails to immunize his or her child puts all of us at greater risk.