The measles-mumps-rubella vaccine is one of the most studied and safety-confirmed vaccines in modern medicine. It is highly effective — two doses provide approximately 97 percent protection. Measles itself is highly contagious and, in unvaccinated populations, can cause severe complications including pneumonia, encephalitis, and death. The United States achieved elimination of endemic measles transmission in 2000 — meaning the disease was no longer continuously spreading within US borders — through decades of vaccination campaigns. It has stayed eliminated through maintained vaccine coverage. When coverage drops, measles comes back. This is not controversial among immunologists.
Kennedy's Record on Vaccines.
Kennedy founded Children's Health Defense in 2011, an organization whose central mission has been opposing vaccines — particularly claiming a link between the MMR vaccine and autism, a claim that has been studied extensively and consistently not supported by the evidence, and that originated from a fraudulent 1998 study by Andrew Wakefield whose medical license was revoked. Kennedy has promoted this claim for years, sued vaccine manufacturers, opposed vaccine mandates, and worked to undermine public confidence in the vaccine development and approval process. His book "The Real Anthony Fauci" accused public health officials of corruption and conspiracy in connection with vaccines and COVID policy.
Kennedy's record is not one of a vaccine skeptic asking reasonable questions. It is a years-long documented campaign against vaccine uptake — a campaign that public health researchers have linked to declining vaccination rates and the re-emergence of preventable diseases in communities where his messaging was influential.
What Happened After His Confirmation.
Measles outbreaks spread across multiple US states in early 2025, including a significant outbreak in Texas that produced cases including in children who had not been vaccinated. Kennedy's public response to the outbreaks was criticized by public health experts as insufficiently supportive of vaccination — he acknowledged measles was spreading but framed his messaging around "choice" and questioning vaccine policy rather than clear guidance to vaccinate. CDC communications on vaccine safety were altered in ways that public health experts said introduced unnecessary ambiguity.
Kennedy's vaccine-related history is extensively documented in his public statements, in court filings from Children's Health Defense, and in investigative reporting by the New York Times and Washington Post. The 2000 US measles elimination declaration is CDC record. The 1998 Wakefield study retraction and Wakefield's medical license revocation are matters of medical record. The 2025 measles outbreaks were tracked by the CDC and reported by multiple outlets. Kennedy's confirmation vote is Senate record.
The core problem with Kennedy at HHS is not that he has questions about health policy. It is that the scientific consensus on vaccine safety and efficacy is not a matter of legitimate scientific debate — it is among the most thoroughly established findings in modern medicine — and the person now responsible for communicating that consensus to the American public does not accept it. When the Secretary of HHS hedges on whether parents should vaccinate their children, some parents won't vaccinate their children. When parents don't vaccinate their children, measles comes back. This is exactly what is happening.
- CDC — 2000 measles elimination declaration; vaccine efficacy and safety data; cdc.gov.
- Wakefield study retraction — The Lancet, February 2010; Wakefield medical license revocation, UK General Medical Council, May 2010.
- Children's Health Defense — Kennedy's founding and leadership; organization's stated mission and lawsuits are public record.
- 2025 Texas and multi-state measles outbreaks — CDC outbreak tracking; reported by AP, New York Times, Washington Post.
- Kennedy confirmation vote — Senate record, February 2025.
- Kennedy public statements on measles outbreaks — reported by multiple outlets; video available.