Thimerosal: Resources Information | Immunize. org Thimerosal: Resources Information Thimerosal (a molecule that contains ethyl mercury) is a widely used preservative in medical products Since 2001, all vaccines routinely recommended for children 6 years of age and younger are thimerosal-free, except for some formulations of inactivated influenza vaccine
Screening Checklist for Contraindications to Injectable Influenza . . . IIV provided in multidose vials contain thimerosal as a preservative Most people who had sensitivity to thimerosal when it was used in contact lens solution do not have reactions to thimerosal when it is used in vaccines
Evidence Shows Vaccines Unrelated to Autism Evidence Shows Vaccines Unrelated to Autism Erroneous claims that vaccines cause autism have led some parents to delay or refuse vaccines for their children Some of the claims are that autism is caused by measles-mumps-rubella (MMR) vaccine, vaccines that contain thimerosal, or by too many vaccines Many studies have been done to test these claims None has shown that vaccines cause autism
Vaccinate Adults February 2012 CDC Fact Sheets Thimerosal is a mercury-containing compound that prevents the growth of dangerous bacteria and | questions and answers | fungus It is used as a preservative for flu vaccines What is thimerosal?
Influenza Vaccine Products for the 2025–2026 Influenza Season 4 In June 2025, ACIP voted to no longer recommend use of inactivated influenza multi-dose vials (MDV) containing thimerosal as a preservative Availability of MDV formula-tions varies by manufacturer As of August 4, 2025, CDC’s website states that there is no evidence of harm caused by the low doses of thimerosal in vaccines, except for minor reactions like redness and swelling at the
MMR Vaccine Does Not Cause Autism -- Examine the evidence! This case-control study investigated the relationship between the risk of Autism Spectrum Disorder (ASD) onset, and early exposure to MMR vaccine and thimerosal measured from vaccinations in the highly genetically homogenous Japanese population
Vaccinations Are Safe: Explaining Why Thimerosal helps prevent bacterial contamination as multiple doses are withdrawn from the vials All vaccines are available in single-dose formulations that do not contain thimerosal 2 Thimerosal is a chemical that contains ethylmercury, not methylmercury
Responding to Parents: Resources Information | Immunize. org In healthcare settings across the nation, healthcare professionals are called upon to attest to the safety of vaccines, the importance of vaccination, and the potentially grave consequences of failure to vaccinate This section provides background information and practical resources that will help them confidently discuss immunization with parents