Measles Surge 2026: How Anti-Vax Misinformation Fuels a Preventable Crisis

The South Carolina Department of Public Health confirmed an outbreak in Spartanburg County beginning October 2, 2025. By late February 2026, the total had reached 973 cases — the largest single US measles outbreak since the disease was declared eliminated in 2000. Of those, 93% of patients were unvaccinated, 90% were children, and 26% were preschoolers. ^{[3] [15]}

The community conditions that allowed the outbreak to take hold are specific and documented. NPR's February 20, 2026 reporting on Spartanburg identified a structurally vulnerable population: the area is described as "solidly conservative," where "vaccination has become wrapped up in politics," with a close-knit Ukrainian- and Russian-speaking immigrant community whose vaccine skepticism community members linked to a long-standing, Soviet-era distrust of government authority. One public charter school in Spartanburg (Global Academy of South Carolina, founded by Ukrainian educators) recorded a vaccination rate of just 21% — catastrophically below the 95% herd immunity threshold. Nearly 10% of county students hold religious exemptions from vaccination. ^[16]

State Senator Josh Kimbrell, whose district includes most of the outbreak's cases, has said he knows people who "haven't set foot in a church in five years" but who nonetheless claim a religious exemption — evidence, in his view, that the exemption pathway is sometimes used as a general opt-out rather than a genuine religious objection, a pattern that recurs in high-exemption communities nationally. The consequences have been severe: a teacher at one affected school spent time in intensive care over the holidays and nearly died. ^[16]

By late February, new case rates had begun declining, and South Carolina DPH officials were cautiously optimistic the outbreak could end sooner than projected; it was ultimately declared over on April 26, 2026, with a final count of 997 cases. The state activated Mobile Health Units to offer free MMR vaccines to unvaccinated Spartanburg residents. However, the virus had already seeded transmission chains in multiple neighboring states. ^{[3] [15]}

The false claims driving measles vaccine refusal in 2025–2026 are not new — they are decades-old myths that have been digitally amplified and, critically, institutionally legitimized.

The original "patient zero" of modern US vaccine hesitancy is Andrew Wakefield's 1998 paper in *The Lancet*, subsequently retracted due to fraudulent data. Wakefield lost his medical license. Despite repudiation across more than 40 independent studies in seven countries involving over 5.6 million people, the claim never died. Robert F. Kennedy Jr. built a two-decade career as an anti-vaccine activist partly on this myth, founding Children's Health Defense in 2011, before his appointment as HHS Secretary. ^[10]

False claims about the MMR vaccine circulate across Facebook groups, TikTok, Telegram channels, and influencer-driven "tradwife" communities. A peer-reviewed study found that misinformation was present in 58.8% of measles-rubella vaccine videos sampled on TikTok; 85.7% of content produced by lay individuals contained misinformation, versus 25% from news/media accounts and 0% from healthcare professionals. Videos flagged as containing misinformation also reached significantly higher engagement (likes, saves, shares) than accurate content when normalized by follower count. ^[22]

A study published in *Science* quantified a structural problem on Facebook: unflagged vaccine-skeptical content that nonetheless reduced people's vaccination intentions had roughly 46 times the aggregate impact of content that fact-checkers had flagged as misinformation — mainly because the unflagged content (such as posts about rare deaths after vaccination) reached far more people. Separately, the European Commission has preliminarily found Meta's Facebook and Instagram in breach of EU Digital Services Act content-moderation and transparency obligations, though not specifically over vaccine content; no comparable US regulatory action exists. On X (formerly Twitter), Community Notes replaced algorithmic misinformation labels, and anti-vaccine content that previously received warning labels now circulates with less restriction in many cases. ^[23]

A 2025 KFF poll of 1,380 US adults found that about a quarter believed vitamin A "probably or definitely" prevents measles infection; about a fifth (roughly 20%) believed the MMR vaccine is more dangerous than measles itself; and about a quarter believed the MMR vaccine probably or definitely causes autism. The partisan dimension was sharp: 35% of Republicans endorsed the autism link vs. 10% of Democrats. Among parents who accepted at least one false claim, 24% had skipped or delayed childhood vaccines — more than twice the rate (11%) among parents who rejected all three claims tested. ^{[5] [6]}

Nature reported in February 2026 on scientists and science communicators going viral on TikTok to counter misinformation on topics including vaccines, climate change, and wellness pseudoscience — part of a broader trend of researchers using short-video platforms to push back on the false claims driving vaccine hesitancy amid the measles resurgence. This is a reactive response: corrections chase misinformation rather than getting ahead of it, a structural failure that policy interventions have so far failed to address. ^[24]

On January 20, 2026, Ralph Abraham — Principal Deputy Director of the CDC and former Louisiana Surgeon General — was asked at a media briefing whether he would consider losing the US measles elimination status to be significant. His response: "Not really...You know, it's just the cost of doing business, with our borders being somewhat porous [and] global and international travel." ^[25]

He went on to characterize potential elimination-status loss as tied to international travel and the "personal freedom" of parents who choose not to vaccinate, saying regulators should "respect those communities that choose to go somewhat of a different route." The statement drew criticism from public health professionals. ^[25]

The federal institutionalization of vaccine misinformation has proceeded through several documented mechanisms:

ACIP Dismantlement: In June 2025, Kennedy fired all 17 voting members of the Advisory Committee on Immunization Practices — the independent expert body that had advised on the childhood vaccine schedule for decades — and replaced them with a panel that includes several vaccine skeptics, among them Robert W. Malone and Martin Kulldorff (a co-author of the Great Barrington Declaration). A later addition, Angelina Farella, a pediatrician, appeared on Newsmax in 2021 saying: "You know how you fight a pandemic, and you know how you fight disease? You treat it," before recommending steroids and vitamins as COVID alternatives instead of vaccination. The ACIP's February 2026 meeting was postponed to March. ^[19]

Schedule Overhaul: On January 5, 2026, the CDC issued a "Decision Memo" restructuring the childhood vaccine schedule, stripping seven vaccines — those protecting against rotavirus, meningococcal disease, hepatitis A, hepatitis B, influenza, COVID-19, and RSV — of universally recommended status, reducing the universal list from 18 diseases to 11. Measles vaccination remained on the schedule, but experts warned the broader overhaul would increase confusion and reduce overall uptake. Dr. Jake Scott of Stanford called it "the most significant weakening of childhood vaccine recommendations...in modern American history." Dr. Yvonne Maldonado of Stanford, reviewing the memo, said: "There are no data, no papers, no discussions at all that are cited in this quote-unquote exhaustive search." ^{[7] [8] [9]}

CDC Website Alteration: In November 2025, under Kennedy's direction, the CDC's vaccine safety webpage was changed to state that "'Vaccines do not cause autism' is not an evidence-based claim," asserting that studies "have not ruled out the possibility that infant vaccines cause autism" and that studies supporting a link "have been ignored by health authorities." This contradicts more than 40 independent studies involving 5.6 million people across seven countries. The change was made by political appointees; autism advocacy organizations (including the Autism Science Foundation and Autism Self Advocacy Network) and pediatric groups, including the American Academy of Pediatrics, condemned it. ^[10]

Vitamin A Promotion: During the West Texas outbreak in March 2025, Kennedy publicly promoted vitamin A and cod liver oil as measles treatments — not established treatments for the disease outside of vitamin-A-deficient patients. A 2026 systematic review found no benefit of vitamin A supplementation on fever duration, hospitalization, or complication rates among children hospitalized with measles in a high-income setting (Italy), noting current US recommendations lean on evidence from lower-income countries with higher rates of vitamin A deficiency. The consequence of the promotion, and of surrounding social-media amplification: fewer than ten pediatric patients at a Lubbock, Texas hospital were treated for vitamin A toxicity/abnormal liver function after receiving vitamin A supplementation alongside or instead of vaccination. ^{[13] [21]}

Jay Bhattacharya as Acting CDC Director: On February 18, 2026 — with South Carolina approaching 1,000 cases and the national total exceeding 1,100 — the White House appointed Jay Bhattacharya (NIH Director and Great Barrington Declaration co-author) as Acting CDC Director, giving him simultaneous control of both agencies. At a Senate hearing, Bhattacharya said he was "absolutely convinced" that the measles epidemic "is best solved by parents vaccinating their children for measles," while also saying he had "not seen a study that suggests any single vaccine causes autism." He is also a named defendant in the 15-state AG lawsuit described below. ^[17]

On February 24, 2026, the attorneys general of Arizona, California, Colorado, Connecticut, Delaware, Maine, Maryland, Michigan, Minnesota, New Jersey, New Mexico, Oregon, Rhode Island, Wisconsin, and the Governor of Pennsylvania filed a federal lawsuit against RFK Jr., the CDC, HHS, and Jay Bhattacharya. The lawsuit targets three specific acts: ^{[14] [18]}

1. The January 5, 2026 Decision Memo that stripped seven vaccines of universally recommended status without scientific review. 2. The dismissal and reconstitution of ACIP with individuals the complaint alleges "lack the scientific qualifications required by ACIP's own charter and the Federal Advisory Committee Act (FACA)." 3. Procedural violations: the complaint alleges the Decision Memo "was not based on any new scientific evidence, any recommendation by a lawfully constituted ACIP, or any systematic review of the available data."

Arizona AG Kris Mayes delivered a sharp summary: "Copying Denmark's vaccine schedule without copying Denmark's health care system doesn't give families more options — it just leaves kids unprotected." ^[18]

Congressional confrontations preceded the lawsuit. When Kennedy testified before the Senate HELP Committee in May 2025, Senator Chris Murphy (D-CT) said Kennedy had "consistently been undermining the measles vaccine" and pressed him on his past claim that the vaccine "wanes very quickly." After Kennedy repeatedly declined to give an unambiguous recommendation for the vaccine, Murphy concluded: "The Secretary of Health and Human Services is no longer recommending the measles vaccine." ^[20]

Kennedy's own responses were deliberately ambiguous. When asked whether he would recommend the MMR vaccine, he stated: "My opinions about vaccines are irrelevant... I don't think people should be taking medical advice from me." ^[20]

This is the second major lawsuit against Kennedy within a year. In July 2025, six medical and public health organizations — the American Academy of Pediatrics, American College of Physicians, American Public Health Association, Infectious Diseases Society of America, Massachusetts Public Health Alliance, and Society for Maternal-Fetal Medicine — along with a pregnant physician, sued HHS over Kennedy's unilateral rescission of COVID-19 vaccine recommendations for children and pregnant people.

On February 4, 2026, PAHO issued a formal epidemiological alert for the Americas region. In the first three weeks of 2026 alone, the Americas recorded 1,031 measles cases across 7 countries — a 43-fold increase versus the 23 cases reported during the same period in 2025. The 2025 regional total was 14,891 confirmed cases and 29 deaths — a 32-fold increase from 2024's 466 cases. Infants under age 1 had the highest incidence rate of any age group. ^[26]

Canada's Warning: Canada lost its measles elimination status on November 10, 2025, designated by PAHO after more than 12 months of sustained transmission producing more than 5,100 cases and 2 deaths. The Americas region as a whole also lost elimination status as a result. Mexico recorded 6,428 cases in 2025 with 24 deaths, a toll that continued climbing into 2026. ^[27]

The US Review, Delayed: PAHO's Regional Verification Commission had originally been invited to meet on April 13, 2026 to evaluate whether the United States and Mexico had also lost elimination status, but on March 2, 2026 PAHO announced the review would instead take place in November 2026, at the Commission's regular annual meeting — postponed at US officials' request to allow time for complete viral genome sequencing needed to determine whether the outbreak represents continuous domestic transmission (which would trigger status loss) or a series of separate introductions from abroad. With 1,136 cases in the first 58 days of 2026 and Spartanburg's outbreak showing sustained community transmission concentrated in a single county, many outside experts expect the delayed review to ultimately find the US has lost its 25-year elimination status — but that determination has not yet been made. ^{[25] [30]}

MMR Coverage Below Threshold: US kindergarten MMR coverage has continued to slide from 95% in the 2019–2020 school year; KFF's most recent analysis puts national coverage at 92.4% for the 2025–2026 school year, leaving roughly 280,000 kindergartners unprotected. Idaho's MMR coverage stands at 75.5%, and more than three-quarters of states now fall below the 95% population-immunity threshold needed to prevent measles transmission. Non-medical exemptions have risen from 2.2% to 4.0% of kindergartners nationally over the same period. Idaho enacted a 2025 law allowing vaccination exemptions "for any reason." ^[11]

The Invisible Victims: The populations who bear the largest burden of the anti-vaccine crisis are precisely those who had no role in creating it.

Infants under 12 months cannot yet receive the MMR vaccine — their protection depends entirely on herd immunity, and PAHO data shows this age group has the highest measles incidence of any in the 2025–2026 Americas outbreak. Immunocompromised individuals — cancer patients in chemotherapy, transplant recipients, people with certain autoimmune conditions — cannot safely receive the live MMR vaccine; their only protection is community immunity. As coverage falls to 21% in some school settings, these patients face exposure risk they cannot personally mitigate. Children of vaccine-accepting parents in high-exemption communities face elevated risk even when fully vaccinated, because the MMR vaccine is about 97% (not 100%) effective — a vaccinated child in a 21%-vaccinated school faces materially greater risk than the same child in a 97%+-vaccinated school. ^[26]

The Global Virus Network — representing virologists from more than 90 Centers of Excellence and Affiliates across more than 40 countries — issued a statement of "deep concern" regarding the ongoing resurgence of measles in the United States and around the globe, warning that "measles anywhere is a threat everywhere." PAHO has specifically called for heightened surveillance around the 2026 FIFA World Cup, a mass-gathering event at which measles could spread internationally. ^[28]

The measles crisis of 2025–2026 is not a mystery. It is a documented, predicted consequence of declining vaccination rates in the face of organized misinformation — now amplified by changes to federal health infrastructure. The path back is also not a mystery; it is the same path that achieved elimination in 2000: high vaccination coverage above the 95% herd immunity threshold, strong ACIP-guided schedule recommendations, and accurate public health communication.

The immediate structural requirements are:

Restore ACIP independence. The 15-state lawsuit challenges the legality of the Kennedy-reconstituted ACIP. Courts will rule on whether the dismissal of all 17 prior expert members violated the Federal Advisory Committee Act. Regardless of legal outcome, restoration of a scientifically qualified ACIP is prerequisite to any credible vaccine policy. The February 2026 ACIP meeting was postponed to March, providing an early opportunity to reverse course.

Restore the CDC's scientific integrity. The alteration of the CDC vaccine safety webpage to suggest the autism-vaccine link is unresolved should be reversed. Pediatric and autism-research organizations that broke publicly with the revised CDC guidance provide the clinical guidance many parents now lack from federal sources. ^[10]

Address platform moderation gaps. A roughly 46-fold aggregate impact advantage for unflagged versus fact-checker-flagged vaccine-skeptical content on Facebook, per peer-reviewed research, represents a structural gap that voluntary fact-checking has not closed. The EU's Digital Services Act enforcement approach has no direct US equivalent. ^[23]

Tighten exemption policies. Idaho's "for any reason" vaccine exemption law, enacted 2025, is a live test of what happens when policy actively enables vaccine avoidance. The South Carolina outbreak — concentrated in a community where nearly 10% of students hold religious exemptions — provides one empirical result. ^{[11] [16]}

The 2026 FIFA World Cup represents a further international transmission risk that PAHO has specifically flagged. PAHO's delayed Regional Verification Commission review, now set for November 2026, will be the formal milestone on US elimination status — but elimination status is a lagging indicator; the underlying erosion in coverage has been underway for years. ^{[26] [30]}

Measles was eliminated from the United States in 2000 because vaccines work. The MMR vaccine remains about 97% effective after two doses. The deaths, hospitalizations, and cases of vitamin A toxicity from the 2025–2026 surge were preventable. The misinformation claims driving vaccine refusal have been refuted by more than 40 independent scientific studies involving over 5.6 million people. The defining feature of the 2025–2026 crisis is that parts of the federal government — the institution with the greatest authority and responsibility to counter these myths — have, through specific documented policy choices, made that job harder rather than easier.