Thimerosal and Autism

Thiomersal (INN) (C9H9HgNaO2S), or sodium ethylmercurithiosalicylate, commonly known in the United States as thimerosal, is an organomercury compound (approximately 49% mercury by weight) used as an antiseptic and antifungal agent.

It was invented and patented by Morris Kharasch. The pharmaceutical corporation Eli Lilly and Company gave it the trade name Merthiolate and it has been used as a preservative in vaccines, immunoglobulin preparations, skin test antigens, antivenins, ophthalmic and nasal products, and tattoo inks. The compound is being phased out from routine childhood vaccines in the United States, the European Union, and a few other countries.

Thiomersal's main use is as an antiseptic and antifungal agent. In multidose injectable drug delivery systems, it prevents serious adverse effects such as the Staphylococcus infection that, in one 1928 incident, killed 12 of 21 children inoculated with a diphtheria vaccine that lacked a preservative. Unlike other vaccine preservatives used at the time, thiomersal does not reduce the potency of the vaccines that it protects. Bacteriostatics like thiomersal are not needed in more-expensive single-dose injectables.

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