Robert F. Kennedy Jr.’s Evolving Stance on Vaccines

Robert F. Kennedy Jr. has long been known for his skepticism towards vaccines. Recently, he expressed strong support for the measles, mumps, and rubella (MMR) vaccine as measles cases surge across the United States. While he now publicly supports the MMR vaccine, there is limited evidence that his position has similarly changed for other vaccines like COVID-19, HPV, and hepatitis B.

Kennedy has spent decades questioning vaccine safety and was a leading figure in the anti-vaccine movement. Since he became HHS secretary, he acknowledged that the MMR vaccine is effective at preventing measles and recommended that children receive it. This is a notable shift from his previous statements. Dr. Paul Offit explained to Newsweek that vaccines go through rigorous development, involving years of research, clinical trials, and reviews by the FDA and CDC. Even post-approval, vaccines are monitored for rare side effects, underscoring their high safety standards.

Change in View on the Measles Vaccine

Kennedy reaffirmed his support for the MMR vaccine in an interview on CNN. He stated that parents should vaccinate their children against measles, highlighting the vaccine’s 97% effectiveness in preventing measles. Despite prior claims of the vaccine’s diminished efficacy over time, his latest comments signify a shift.

Position on Other Vaccines

However, Kennedy remains skeptical about COVID-19 vaccines, supports changes to hepatitis B vaccination recommendations for newborns, and maintains his criticism of the HPV vaccine. His comments on MMR have gained attention amidst one of the largest measles outbreaks in years, signaling a change in rhetoric. Yet, there’s less evidence of such a shift regarding COVID-19, HPV, and other routine vaccines.

Measles Outbreak in the U.S.

The CDC reported 2,371 confirmed measles cases as of July 30, 2026, marking the highest annual total in over three decades. Outbreaks have occurred across 45 jurisdictions, with most infections linked to outbreaks in under-vaccinated communities. The CDC has responded by deploying experts, providing resources, and emphasizing the efficacy of the MMR vaccine.

Criticism of COVID-19 Vaccine Recommendations

Kennedy questioned the broad COVID-19 vaccine recommendations and their risk-benefit profile, especially for children. Despite criticisms, Dr. Offit noted that studies show COVID-19 vaccines prevent serious diseases in children.

HPV Vaccine Concerns

Kennedy has repeatedly criticized the HPV vaccine, known for preventing HPV-related cancers. While his stance on some vaccines has evolved, he has not fully embraced the HPV vaccine.

Hepatitis B Vaccine Discussions

Kennedy challenged the hepatitis B vaccination for newborns, leading to proposed changes in the immunization schedule. These changes were blocked by a federal court order, but medical groups continue to support existing recommendations.

Overall, Kennedy has softened his rhetoric towards the MMR vaccine significantly, but maintains skepticism and advocates for reviews of other vaccine policies.