Autism is widely regarded as among the most complicated neurodevelopment disorders, with rapid increases in incidence reported recently.
Since the last decades of the twentieth century, Autism spectrum disorders (ASD) increased steadily in the USA and around the world.
One in 88 children -- about five times as many boys as girls -- are diagnosed with autism, according to the U.S. Centers for Disease Control and Prevention. But its cause is unknown and there is no cure for the disorder, which begins in early childhood and affects social, behavioral and language development.
Genetics and environmental and immunological factors are thought to play a role, and possibly the interaction of these and other variables, Chez said.
Autism is not actually one disorder, but stretches across a spectrum in which some children have more severe symptoms than others.
One theory suggests autism occurs because cells in the brain, called neurons, are not connecting normally. Stem cells may address this issue.
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