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Autism is a complex neurodevelopmental disorder. It was announced in August of 2009 by the National Survey of Children's Health (NSCH), that somewhere around one percent of all US children currently have an autism spectrum disorder.
Many causes have been proposed for autism, but doctors and researchers are not yet sold on any particular theory. Researchers suggest that autism is largely inhereted, although they aren't yet sure about which genes are responsible. Other causes suggested are maybe environmental, because of the higher cases in some regions. Another theory is that vaccines children receive at a young age can be linked to autism, although there is no evidence that proves this.
Despite the fact there is no official evidence linking the vaccines to autism, many parents are choosing do research on their own to find out if they want to choose to immunize their children. Some choose to delay the vaccines for an older age and more spread out regimen, instead of the "vaccine overload" that parents are suggested to follow.
This graph below shows the rise of autism in America in the last 40 years
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