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What Is Thimerosal? Why Most Vaccines Don’t Contain Mercury Anymore | Scientific American
https://www.scientificamerican.com/article/what-is-thimerosal-why-most-vaccines-dont-contain-mercury-anymore/
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Thimerosal, which contains an organic compound of mercury, has mostly been phased out as a preservative for vaccines. Here’s how we know it is safe and why we still use it in some vaccines given to adults