In continuing coverage, USA Today reports, “For many families, the quest for the causes of autism has grown more urgent with the news that the estimated prevalence of the condition grew by 23% from 2006 to 2008, a Centers for Disease Control and Prevention report said last week.”
In the majority of cases, researchers “can’t tell parents what caused their child’s autism, says Thomas Insel, director of the National Institutes of Mental Health.
In large part, the causes of autism – which is likely not one disease, but a group of conditions with related symptoms – remain a mystery.”
However, autism is not caused by vaccines, researchers point out.
Some two dozen studies have found no association between vaccines and autism.