The Early infantile autism reference article from the English Wikipedia on 24-Jul-2004
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Early infantile autism

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Early infantile autism, discovered by Leo Kanner, is a form of autism that is present from birth. When most people think of autism, they think of Early infantile autism. Historically, EIA is more common than regressive autism, which appears at 18 months.

Some people blame this on the MMR vaccine, which they state has trace quantities of lead in it.