What Doesn't Cause Autism?

Now that breast milk is being pointed to as a cause of autism based on research on rats by University of California neuroscience professor Michael Merzenich (a 2007 study found developmental abnormalities in rat pups who were nursed by mothers who had been exposed to certain PCBs during pregnancy and in the early weeks after giving birth; more discussion at About.com)----and me having noted a very wide assortment of purported causes of autism (TV, ultrasounds) in my past four years of daily blogging---one wants to throw down the proverbial gauntlet (if not throw up one's hands) and say what hasn't been suggested as a cause for autism?
You are welcome to note potential future candidates for the title of "autism cause of the moment" in the comments.








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