autism

Prenatal viral infection has been called the principal non-genetic cause of autism. Prenatal exposure to rubella or cytomegalovirus activates the mother's immune response and may greatly increase the risk for autism in mice. Congenital rubella syndrome is the most convincing environmental cause of autism. A child or adult with autismspectrum disorder may have limited, repetitive patterns of behavior, interests or activities, including any of these signs: Performs repetitive movements, such as rocking, spinning or hand flapping. Performs activities that could cause self-harm, such as biting or head-banging.