What has FDA done to address the issue of mercury containing preservatives in vaccines?
Under the FDA Modernization Act (FDAMA) of 1997, FDA carried out a comprehensive review of the use of thimerosal in childhood vaccines. Conducted in 1999, this review found no evidence of harm from the use of thimerosal as a vaccine preservative, other than local hypersensitivity reactions. As part of the FDAMA review, FDA evaluated the amount of mercury an infant might receive in the form of ethylmercury from vaccines under the U.S. recommended childhood immunization schedule and compared these levels with existing guidelines for exposure to methylmercury, as there are no existing guidelines for ethylmercury, the metabolite of thimerosal. At the time of this review in 1999, the maximum cumulative exposure to mercury from vaccines in the recommended childhood immunization schedule was within acceptable limits for the methylmercury exposure guidelines set by FDA, Agency for Toxic Substances and Disease Registry (ATSDR), and the World Health Organization (WHO). However, depending on the
