HappiestMom
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The mercury compound in thimerosal—ethylmercury—is chemically different from methylmercury, which is widely recognized as an environmental pollutant. Two key differences are that, unlike methylmercury, ethylmercury is (1) excreted from the body quickly, and (2) not easily transported across the blood-brain barrier (a structure of tightly packed cells that keeps potentially harmful substances in the bloodstream from entering the brain). The amount of ethylmercury in a thimerosal-preserved vaccine is minuscule compared with the amount of mercury that is required to cause symptoms of mercury poisoning. Also, the signs and symptoms of mercury poisoning are very different from the characteristics of autism. The chemical difference between ethylmercury and methylmercury is similar to the difference between ethyl alcohol, found in wine and beer, and methyl alcohol (wood alcohol), a poison found in antifreeze.