Studying individual school districts in Texas, the epidemiologists found that those districts with the highest levels of mercury in the environment also had the highest rates of special education students and autism diagnoses. There was a strong, direct relationship between mercury and autism levels. The incidence of autism has grown dramatically over the last two decades, from about one in every 2,000 children to as high as one in every 166. The purported link between autism and mercury has been a subject of intense debate. In the past it has centered primarily on the mercury-containing preservative thimerosal, which was once widely used in vaccines. Many parents have argued that thimerosal causes autism because their children seemed to develop the neurological disorder shortly after they received childhood vaccinations.
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