AUTISM SPECTRUM DISORDER Abstract Autism spectrum disorder, or ASD, has no apparent cause for happening, but scientists are getting closer to being able to spot the specific genes that could increase the risk for ASD. It's a disorder that can vary greatly in severity, symptoms, levels of impairment, and skills. There are five different types of autism, autism disorder (classic autism), Asperger's syndrome (AS), pervasive developmental disorder not otherwise specified (PDD-NOS), Rett's disorder…
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