Flu shots that have more than one dose of vaccine contain thimerosal; other versions don’t have it. HHS said Wednesday that vaccine makers have said they have the capacity to replace the shots that do contain thimerosal so that vaccine supplies aren’t interrupted.

The mercury-based ingredient has prompted concerns from some organizations, although the CDC has said there is no evidence it causes harm.

The US Department of Health and Human Services has adopted a recommendation to remove a preservative called thimerosal from all influenza vaccines distributed in the United States.

HHS Secretary Robert F. Kennedy Jr. formally accepted recommendations that would require all vaccine manufacturers to discontinue using the preservative thimerosal in flu vaccines.

While few shots still contain thimerosal, the move eliminates a vaccine option for Americans and is a win for the anti-vaccine movement.

The Wisconsin DHS added a requirement for the 2024-25 school year for the Meningococcal conjugate vaccine (MenACWY) by seventh grade, and a booster by 12th grade. Meningococcal disease is a rare, but serious disease that can be fatal in 10% to 15% of people who get it.

Health Secretary Robert F. Kennedy Jr. recently announced a change to the Centers for Disease Control and Prevention's vaccine schedule that he says reflects a new approach to public health and personal choice.

Kennedy Jr., the nation’s health secretary, sparked fierce criticism earlier this year when he pledged to determine what causes autism by September — a deadline deemed wildly unrealistic by many longtime researchers.