A new study has found no association between infant and prenatal exposure to thimerosal, a mercury-containing preservative used in a number of vaccines, and autism. In an article published in the medical journal Pediatrics, the authors wrote that thimerosal in vaccines "does not increase the risk for autism spectrum disorder (ASD)". They actually found that children with ASDs had had less exposure to thimerosal-containing vaccines than the children in their study who did not have an ASD... 
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