On 15 July at
Beyond the Noise Dr. Paul Offit wrote, "First, thimerosal was a trivial addition to the burden of mercury encountered from living on the planet Earth. Because mercury is in the earth’s crust, we ingest mercury every day. It’s in air, soil, and water or anything made from water, such as breast milk and infant formula. Environmental mercury is methylmercury, which has a much longer half-life than the ethylmercury in some vaccines, so it is more likely to accumulate...Because the burden of environmental mercury is much greater than mercury contained in vaccines,
studies had shown that the level of mercury in the bloodstream doesn’t change after receiving thimerosal-containing vaccines." Dr. Offit continued, "Western Europe had removed thimerosal-containing vaccines in the early 1990s. Also, some Canadian provinces used thimerosal-containing vaccines and others used the same vaccines that didn’t contain thimerosal. This made it easy to perform studies. About ten
studies have shown that children who had received thimerosal containing vaccines were not at greater risk of neurodevelopmental problems, including autism, than those who received the same vaccines that didn’t contain thimerosal."
One of the studies that Dr. Offit cited
stated, "Because of the differing pharmacokinetics of ethyl and methyl mercury, exposure guidelines based on oral methyl mercury in adults may not be accurate for risk assessments in children who receive thimerosal-containing vaccines." A portion of the structure of thimerosal is the ethyl mercury group.