which low-level exposure to the substance causes a beneficial effect. He played an active role in the initial confusion about the suggested relationship thiomersal and vaccines, testifying twice to Congress about his views. Deth's hypothesis is, however, contradicted by much of the current literature about the causes of autism, which indicates that the levels of thimerosal found in vaccines and other sources cannot be directly implicated as a cause. This aspect of his research attracted such controversy that a dean at Northeastern University once wrote a letter to Deth telling him to stop. See also List of vaccine-related topics References External links 1945 births American neuroscientists American pharmacologists Autism researchers Living people Northeastern University faculty People from Boston Thiomersal and vaccines University at Buffalo alumni University of Miami alumni