Is autism a global issue, or is it only an issue in industrialized nations?

I am just curious whether autism is a global issue, or just an issue in countries where children get immunizations. Are there studies? On the Today Show, doctors were claiming that autism just surfaces around the same time children are immunized. Wouldn’t this be easy to prove by assessing the rates of autism in children of underdeveloped nations (who haven’t been immunized)?

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