The U.S. Centers for Disease Control and Prevention has compared the incidence of autism with the amount of thimerosal received from vaccines. Preliminary results indicated no change in autism rates relative to the amount of thimerosal a child received during the first six months of life (from 0 micrograms to greater than 160 micrograms). A weak association was found with thimerosal intake and certain neurodevelopmental disorders (such as attention deficit hyperactivity disorder) in one study, but was not found in a subsequent study . Additional studies are planned, but it is unlikely that any significant association will be found.
An Institute of Medicine (IOM) committee, which issued a comprehensive report in October 2001, found no proof of a link between thimerosal-containing vaccines and autism, attention deficit-hyperactivity disorder, speech or language delays, or other neurodevelopmental disorders .
A study published in 2002 of infants who were 6 months of age or younger compared the levels of mercury in the blood, hair, urine, and stool of 40 who received vaccines containing thimerosal and 20 who received vaccines without thimerosal. The study found:
- Mercury levels in blood and urine were low in all infants studied and in many cases too small to measure. There was no observed dose-dependent relationship between the level of thimerosal received through vaccination and the level of mercury in the body.
- Mercury levels in blood did not exceed, at any time, the blood levels that correspond to Environmental Protection Agency guidelines for exposure.
- Mercury levels in the stool of infants receiving vaccines containing thimerosal were relatively high compared to mercury levels in the stool of infants who were not exposed to thimerosal, providing evidence that mercury from thimerosal is eliminated in the stool of infants.
The researchers concluded that, "Administration of vaccines containing thiomersal does not seem to raise blood concentrations of mercury above safe values in infants." .
The use of chelation therapy to treat autistic children is completely bogus. Three successful lawsuits have been filed by parents who believe they were victimized in this way .