Researchers don't know exactly how many people in the United States have ASD.
The latest estimates suggest that:
The CDC is the government agency that studies how many people have autism and other diseases. Visit the CDC website for more information on how many people have ASD: http://www.cdc.gov/ncbddd/autism/data.html
More people than ever before are being diagnosed with ASD, but it is not clear why.
Some of this increase could be due to a broader definition of autism, better efforts in diagnosis, or greater awareness about symptoms. But researchers can't rule out the possibility that there has been a true increase in the number of autism cases.4,5,6,7,8
Research shows that some groups are at higher-than-normal risk for ASD:
More research is needed to better understand why these factors increase autism risk.
Current figures show that ASD occurs in all racial, ethnic, and social groups.
Autism is diagnosed more often in some groups than others.20,21 However, there is no clear evidence that any racial or ethnic groups are at greater risk for autism than are others.22
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