Measles Cases Hit 35-Year US High as HHS Secretary Kennedy Challenges Vaccine Science on National Television
Key Insights
The CDC has confirmed 2,371 measles (search) cases in 2026, surpassing the full 2025 total and marking the highest annual count in the United States since 1991.
HHS Secretary Robert F. Kennedy Jr. appeared on CNN (search) and disputed COVID vaccine efficacy for children, contradicting positions maintained by his own agency.
US kindergarten MMR vaccination rates have fallen from 95.2% in 2019–2020 to 92.5% in 2024–2025, dropping below the 95% herd-immunity threshold needed to prevent outbreaks.
The United States is experiencing its worst measles (search) outbreak in 35 years, with 2,371 confirmed cases as of July 30, 2026, even as Health and Human Services Secretary Robert F. Kennedy Jr. used a national television appearance to challenge the scientific consensus on vaccine efficacy maintained by his own agencies.
The case count, reported by the Centers for Disease Control and Prevention (search), has already surpassed the full 2025 total of 2,289 cases — which itself was the highest annual figure since 1991. Thirty-seven outbreaks have been recorded in 2026, with 94% of cases linked to active outbreaks and 93% involving individuals who were unvaccinated or whose vaccination status is unknown.
A Televised Confrontation Over Vaccine Science
Kennedy's appearance on CNN (search)'s State of the Union on Sunday morning quickly escalated into a 21-minute confrontation with anchor Dana Bash. The HHS Secretary demanded that Bash cite a specific study demonstrating that COVID vaccines protected children, and when she referenced research suggesting vaccine disinformation may have cost between 100,000 and 200,000 American lives, he responded: "You are saying nonsense! You are saying something that you cannot show me a single study that says that."
The exchange carried unusual weight because Kennedy was effectively disputing positions that his own agency maintains. The CDC has recommended COVID vaccines for children aged six months and older, citing reductions in symptomatic disease and hospitalization risk. The Lancet published a systematic review in 2026 finding mRNA vaccines safe across billions of administered doses.
Bash pushed back directly: "It is also factually true that the COVID vaccine worked. The COVID vaccine prevented deaths. There is data, upon data, upon data."
When the conversation turned to pandemic preparedness, Kennedy emphasized constitutional rights over public health protocols. "We need to protect our constitutional rights. That is the primary obligation in our country," he said. When Bash noted she was asking about a potential public health crisis rather than rights, Kennedy accused CNN (search) of having been "part of the problem" during the pandemic, citing what he called "absolute press malpractice."
The Measles (search) Numbers in Context
The biology driving the outbreak is well understood. Measles (search) carries a basic reproduction number of approximately 12 to 18, making it among the most contagious airborne pathogens known. The CDC recommends a two-dose MMR vaccination schedule to achieve approximately 97% protection.
The US kindergarten MMR vaccination rate has fallen from 95.2% in the 2019–2020 school year to 92.5% in 2024–2025 — below the 95% herd-immunity threshold required to prevent outbreak propagation. The Pan American Health Organization is expected to formally review, and likely revoke, the US measles (search) elimination status the country has held since 2000 at its November 2026 meeting.
South Carolina leads all jurisdictions in 2026 case counts with 670 confirmed cases, followed by Utah at 518 and Texas at 182. The Spartanburg County, South Carolina outbreak — the largest the country has seen in recent decades — recorded nearly 1,000 cases before being declared over in April 2026.
Kennedy, on air, attributed the disease's spread almost entirely to religious communities. "The communities that are suffering from measles (search) are almost all religious communities that just don't vaccinate," he told Bash. The West Texas outbreak that began in January 2025 did originate in a Mennonite community but spread rapidly to unvaccinated people outside that group, ultimately reaching nearly 800 cases and including the deaths of two children. No measles deaths have been reported in 2026 as of the CDC's July 30 update.
Actions Taken at HHS and CDC
Kennedy's television statements follow a series of documented actions at the agencies he oversees. In November 2025, Kennedy personally ordered the CDC to remove language from its website stating that vaccines do not cause autism — a change he confirmed to the New York Times. The page now states that the claim vaccines do not cause autism "is not an evidence-based claim," contradicting decades of peer-reviewed literature including nine major epidemiological studies that have found no link between vaccines and autism spectrum disorder.
Sen. Bill Cassidy, a Republican who voted to confirm Kennedy after Kennedy pledged not to make this change, publicly condemned the revision.
In August 2025, Kennedy cancelled $500 million in mRNA vaccine development contracts and disbanded the Advisory Committee on Immunization Practices — the expert panel that translates FDA vaccine approvals into clinical guidance. He fired CDC Director Susan Monarez after she refused to implement his vaccine policy directives; four other senior CDC officials resigned in solidarity, including the agency's chief medical officer, its top immunization director, and its director for emerging and zoonotic infectious diseases.
As of early 2026, 80% of the top director positions at the CDC stood vacant, with no permanent director, principal deputy director, chief of staff, or chief medical officer.
In May 2025, the "Make America Healthy Again" report released under Kennedy's leadership cited more than 500 studies, but an investigation by the nonprofit news outlet NOTUS found that seven of those citations referenced studies that did not exist, including one attributed to epidemiologist Katherine Keyes who confirmed she had never authored the listed paper. The White House called the errors "formatting issues."
Expert Response
Dr. Ashish Jha, dean of Brown University's School of Public Health and a former White House COVID-19 response coordinator, described Kennedy's claims about vaccine efficacy in a CNN (search) appearance following the interview, saying: "There was a lot of information that Secretary Kennedy said that just isn't true. It's just factually not true."
Dr. Paul Offit, director of the Vaccine Education Center at Children's Hospital of Philadelphia, has directly rebutted Kennedy's earlier claim that MMR immunity wanes quickly, stating that measles (search) elimination in the US — which persisted from 2000 until 2025 — "could never happen if immunity waned."
At a congressional hearing in April 2026, Kennedy himself acknowledged that the MMR vaccine is "safe and effective" but immediately qualified the statement with "for most people."
The interview ended approximately 15 minutes after the confrontation first escalated to open argument, without resolution on any substantive public health question. The questions that remain unanswered: whether Kennedy's television appearance will affect vaccination decisions, whether CDC leadership will be restored before the next outbreak requires it, and whether the 2026 measles (search) toll will stop climbing before year's end.