Hepatitis B vaccines given at birth have essentially eliminated the disease in kids. A vote this week could upend that success.

Prasad was hired by Health Secretary Robert F. Kennedy Jr., a long-time anti-vaccine activist, who has been working to remake U.S. vaccine policy and has called for placebo-based trials of vaccines in the past. Many scientists say it is not typically possible to run such trials for ethical reasons.

One dose of a bivalent or nonavalent HPV vaccine was noninferior to two doses, the randomized ESCUDDO trial found. Vaccine effectiveness was at least 97% against HPV16 or 18 infection no matter whether a participant received one or two doses of the bivalent or nonavalent vaccine.

FDA chief medical officer Vinay Prasad told reporters that the agency would be changing its vaccine approval process.

The new law shows how blue states are trying to counter Health Secretary Robert F. Kennedy Jr.’s skeptical approach to vaccines.

A new study suggests a single HPV vaccination appears just as effective as two doses at preventing the viral infection that causes cervical cancer.

By blocking a molecule that pushes the immune system into overdrive, a vaccine protects mice from life-threatening anaphylaxis

Vaccine advisers to the US Centers for Disease Control and Prevention may vote this week to make a major change to the childhood vaccine schedule, potentially delaying a dose of the hepatitis B vaccine given to newborns by weeks or even years.