Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. Vaccine Safety: Mercury and Vaccines (Thimerosal) "Thimerosal is a mercury-containing preservative used in some vaccines ... since the 1930's." This site provides the CDC's position on recent research on autism and Thimerosal: "Some people believe increased exposure to thimerosal ... explains the higher prevalence in recent years. However, evidence from several studies examining trends in vaccine use and changes in autism frequency does not support such an association." From the Centers for Disease Control and Prevention (CDC). http://www.cdc.gov/vaccinesafety/updates/thimerosal.htm Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *