Family physician Dr. Patricia Kellner questioned Health and Human Services Secretary Robert F. Kennedy Jr. about the decision to abandon the recommendation that all newborns receive a hepatitis B vaccine within 24 hours of birth, a policy change that has been controversial. Kellner argued that hepatitis B is more common among drug users and can be asymptomatic. Kennedy defended the policy change, arguing that it was driven by concerns about inadequate safety testing and that the vaccine was not taken off the market or removed from insurance coverage.