It turns out a shitload of studies have been done on MMR, thimerosal, and simultaneous vaccination.
http://www.journals.uchicago.edu/doi...10.1086/596476
Quote:
Twenty epidemiologic studies have shown that neither thimerosal nor MMR vaccine causes autism. These studies have been performed in several countries by many different investigators who have employed a multitude of epidemiologic and statistical methods. The large size of the studied populations has afforded a level of statistical power sufficient to detect even rare associations. These studies, in concert with the biological implausibility that vaccines overwhelm a child’s immune system, have effectively dismissed the notion that vaccines cause autism. Further studies on the cause or causes of autism should focus on more‐promising leads.
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