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Autism is a chronic developmental disorder.
Its main characteristics are problems in social interaction, communication, and restrictive and repetitive interests and activities. The causes of autism are unknown in most cases. However, recent scientific studies indicate that autism may be a genetically based disorder that occurs before birth. In fact, a working group convened by the National Institutes of Health concluded in 1995 that autism is a genetic condition. It is extremely unlikely, if not impossible, that vaccination causes autism, but we do know that vaccines prevent dangerous and deadly diseases.