Olson CD. Does Prenatal Ultrasound Increase Risk of Autism?. J Am Osteopath Assoc 2009;109(2):71–72. doi: 10.7556/jaoa.2009.109.2.71.
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In February 2007, the Centers for Disease Control and Prevention issued their ADDM [Autism and Developmental Disabilities Monitoring] autism prevalence report. The report, which looked at a sample of 8 year olds in 2000 and 2002, concluded that the prevalence of autism had risen to 1 in every 150 American children, and almost 1 in 94 boys.
Scientists aren't certain what causes autism, but it's likely that both genetics and environment play a role.... Studies of people with autism have found irregularities in several regions of the brain.... These abnormalities suggest that autism could result from the disruption of normal brain development early in fetal development caused by defects in genes that control brain growth and that regulate how neurons communicate with each other.
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