The incidence of autism is rising, and only part of that can be explained by greater awareness. Please read this link to an article in the Huffington Post.
"Today (March 21, 2013) the CDC announced a 72% increase in the diagnosis of autism over the past four years. One of every fifty children aged six years to 17 years has an autism spectrum diagnosis. Ten years ago, the number was 1/150.
The previous two decades saw a 600% increase in autism diagnosis and experts have said that 200% of that could be attributed to better diagnosis and more awareness of autism but the other 400% was caused by changes in genetics and environmental impact on genetics."
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