A birth dose of the vaccine, recommended for newborns since 1991, is up to 90% effective in preventing infection from the mother if given in the first 24 hours of life. If babies receive all three doses, 98% of them have immunity from the incurable virus, with the protection lasting at least 30 years.

But on Tucker Carlson’s podcast in June, Health and Human Services Secretary Robert F. Kennedy Jr. falsely claimed that the hepatitis B birth dose is a “likely culprit” of autism.

He also said the hepatitis B virus is not “casually contagious.” But decades of research shows the virus can be transmitted through indirect contact, when traces of infected fluids like blood enter the body when people share personal items like razors or toothbrushes.

The committee’s recommendations carry weight. Most private insurers must cover the vaccines the Advisory Committee on Immunization Practices endorses, and many state vaccination policies are directly linked to its guidelines.