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If thimerosal was used in vaccines for many years, why did it become a concern?

April 26, 2017thimerosal Used vaccines

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If thimerosal was used in vaccines for many years, why did it become a concern?

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The Food and Drug Administration (FDA) Modernization Act of 1997 called for the FDA to review and assess the risk of all mercury containing food and drugs. As part of this effort, the FDA conducted a review of mercury content in vaccines.