![]() Many well conducted studies have concluded that thimerosal in vaccines does not contribute to the development of autism. Research does not show any link between thimerosal in vaccines and autism, a neurodevelopmental disorder. Scientific research does not show a connection between thimerosal and autism. Although rare, some people may be allergic to thimerosal. ![]() The most common side-effects are minor reactions like redness and swelling at the injection site. There are some side effects of thimerosal in vaccines. Data from many studies show no evidence of harm caused by the low doses of thimerosal in vaccines. Thimerosal use in medical products has a record of being very safe. Thimerosal has been shown to be safe when used in vaccines. ![]() When thimerosal enters the body, it breaks down to ethylmercury and thiosalicylate, which are readily eliminated. Thimerosal does not stay in the body a long time so it does not build up and reach harmful levels. The human body eliminates thimerosal easily. In some vaccines, preservatives, including thimerosal, are added during the manufacturing process to prevent germ growth. Contamination by germs in a vaccine could cause severe local reactions, serious illness or death. Introduction of bacteria and fungi has the potential to occur when a syringe needle enters a vial as a vaccine is being prepared for administration. Thimerosal is added to vials of vaccine that contain more than one dose (multi-dose vials) to prevent growth of germs, like bacteria and fungi. Thimerosal prevents the growth of bacteria in vaccines. Thimerosal contains ethylmercury, which is cleared from the human body more quickly than methylmercury, and is therefore less likely to cause any harm. In the United States, federal guidelines keep as much methylmercury as possible out of the environment and food, but over a lifetime, everyone is exposed to some methylmercury. At high exposure levels methylmercury can be toxic to people. Methylmercury is the type of mercury found in certain kinds of fish. Two types of mercury to which people may be exposed - methylmercury and ethylmercury - are very different. Mercury is a naturally occurring element found in the earth’s crust, air, soil, and water.
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