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flag Thimerosal, a mercury-based preservative in vaccines, has been reduced in most childhood and flu vaccines due to safety concerns.

flag Thimerosal, a mercury-based preservative used in vaccines since the 1930s, has been largely removed from most childhood and flu vaccines due to safety concerns, despite studies showing no link to autism. flag Most flu vaccines now come in single-dose syringes, minimizing thimerosal use. flag The U.S. government may soon recommend thimerosal-free flu shots, though health experts argue the risk from influenza outweighs any potential risks from thimerosal.

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