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Thimerosal is a common medical class preservative used to prevent vaccines from spoiling, to neutralize bacteria used to create some vaccines, and to prevent bacterial contamination of the final vaccines. Many vaccines administered routinely to infants contain thimerosal preservative. Statistically significant reports of Thimerosal containing vaccines have been linked to cases of Autism in children receiving those vaccines.

The American Academy of Pediatrics (AAP) in July of 1999 issued a joint statement with the US Public Health Service (USPHS) warning of concerns about thimerosal. Which is a preservative containing mercury used in vaccines and Thimerosal contains another mercury compound called ethyl mercury. Mercury is a known toxin dangerous to human immune systems, as well as motor, sensory and neurological functions.

The FDA warns that infants may be exposed to levels of ethyl mercury, depending on the vaccines received, that can possibly exceed federal guidelines for methyl mercury. Mercury toxicity in children appears similar to the observable symptoms of autism.

The increase in number of children with autism since 1990 appears to correlate with the increased hepatitis B and HIB vaccines administered to infants during that time.