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In 2004, the Institute of Medicine concluded that the body of epidemiological evidence did not support a causal association between autism and thimerosal-containing vaccines. Nonetheless, concerns linger about a relation between autism and thimerosal exposure from vaccines and immunoglobulin. In a case-control study involving 256 children with autistic spectrum disorder (ASD) and 752 matched controls (age range, 6–13 years), investigators from the Centers for Disease Control and Prevention examined the relation between autism and prenatal and infant exposure to ethylmercury from thimerosal-containing vaccines and immunoglobulin. Mercury exposure during the prenatal period (maternal vaccination) and from birth to 1 month, 7 months, and 20 mo…