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A 1995 National Institutes of Health (NIH) working group reached a consensus that autism probably results from a genetic susceptibility that involves multiple genes.
To date, genetic causes for one disorder commonly accompanied by autism (Fragile X) and one autism-spectrum disorder (Rett syndrome) have been identified and genetic "hotspots" for autism have been found.
PDD-NOS, also called atypical autism or mild autism, means having differences in some of the same areas as in autism, only not to such a great extent. The Center for Disease Control and Prevention’s (CDC) Autism and Developmental Disabilities Monitoring (ADDM) Network released data in 2007 that found about 1 in 150 8-year-old children in the areas of the United States they monitor had an ASD For more on the numbers: Prevalence of ASDs, from the CDC.A child with PDD-NOS does not meet the criteria for any other specific PDD/ASD. Autism occurs throughout the world in families of all racial, ethnic and social backgrounds.