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Though most flu vaccines don't include the preservative thimerosal, advisers to the CDC have recommended against using it.
Marie D. De Jesus/Houston Chronicle/Hearst Newspapers
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Getty Images
Why is the additive, safely used since the 1930s, being questioned again?
A laboratory studying sickle cell disease at the National Heart, Lung, and Blood Institute's Cellular and Molecular Therapeutics Laboratory, at the National Institutes of Health on February 8, 2024, in Bethesda, Maryland.
BRENDAN SMIALOWSKI/AFP via Getty Images
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AFP