Is autism a disease caused by immigrants?

Steve Sailer:

Finally, I don't know why nobody ever talks about the possibility that autism could be caused by an infection. If the disease is truly growing rapidly in number of victims (which seems likely, although I'm not convinced), the most likely cause would be the introduction into America of a germ of foreign origin, just like AIDS wasn't caused by some sudden genetic shift, but by the arrival of an African germ.

People point to the supposed high number of autistic children in Silicon Valley as evidence for the assortative mating theory, but Silicon Valley is unusual in a number of ways, including its higher number of immigrants from Asia.

Autism is such a terrible disease that we need to look at all the possibilities and not rule out unpleasant ones just because we might find the truth disturbing.

In the news:

A question of breeding