The CDC's newly rebuilt Advisory Committee on Immunization Practices (ACIP) took aim Thursday at a mercury-based preservative long targeted by vaccine skeptics, recommending that children, pregnant women, and all other adults use only single-dose seasonal influenza vaccines without thimerosal.

Robert F. Kennedy Jr.’s revamped Advisory Committee on Immunization Practices has struck its first blow against established vaccine practice, recommending against the use of flu shots that contain a preservative that has been used in shots for decades.

The CDC's Advisory Committee on Immunization Practices voted on the flu vaccine, raising concerns about a rarely used preservative. Medical groups worry this will "sow distrust" in vaccines.