Utah Emerges as Epicenter of Growing US Measles Outbreak

Utah has reported 583 confirmed measles cases since the outbreak began in the summer of 2025, with 121 new cases in the past three weeks alone [1]. The state has now overtaken South Carolina as the most active measles outbreak in the United States, accounting for roughly a third of all new infections nationwide [2]. Nationally, the CDC has confirmed 1,714 cases across 33 jurisdictions so far in 2026 — already three-quarters of the 2,281 total cases reported in all of 2025 [3].

The numbers place 2026 on track to become one of the two worst years for measles in the U.S. since the disease was declared eliminated in 2000 [4]. And the trajectory is accelerating: Utah's caseload jumped 30% in a single recent week [5].

Source: Utah DHHS

Data as of Apr 10, 2026CSV

The National Picture: A Disease Declared Eliminated Returns

To understand what is happening in Utah, the broader national context matters. In 2019, the U.S. recorded 1,282 measles cases — at the time, the worst year since 1992 [3]. Cases plummeted during the COVID-19 pandemic (13 cases in 2020), then began climbing again: 121 in 2022, 285 in 2024, and 2,281 in 2025 [3]. The 2026 total of 1,714 cases, reached barely three months into the year, has already surpassed the 2019 peak by more than 400 cases [4].

Source: CDC

Data as of Apr 10, 2026CSV

Ninety-two percent of all 2026 cases involve people who are unvaccinated or whose vaccination status is unknown [4]. No measles-related deaths have been confirmed in 2026, though three deaths occurred during 2025 outbreaks [6]. Ninety-one people have been hospitalized nationally this year, a 5% hospitalization rate [6].

The Pan American Health Organization announced in November 2025 that the Americas region — including the U.S. and Canada — had lost its measles elimination status after endemic transmission persisted for more than 12 months [7]. Whether the U.S. individually has lost elimination status remains under review by the CDC, with a determination expected by November 2026 [7]. Staffing cuts at the CDC's measles lab have contributed to delays in that assessment [7].

Ground Zero: Southwest Utah and the FLDS Communities

The Utah outbreak began in the state's southwest corner during the summer of 2025, in small communities near the Arizona border [8]. Most residents in the area are affiliated with the Fundamentalist Church of Jesus Christ of Latter-day Saints (FLDS), a religious group described by local health officials as "wary of outsiders" [8].

The Southwest Utah Public Health Department's jurisdiction — covering Washington, Iron, Kane, Beaver, and Garfield counties — accounts for 249 of the state's 583 cases, or 43% of the total [1]. Washington County, home to the towns of Hildale and Hurricane, has been particularly affected [9].

By February 2026, the virus had spread beyond the southwest to other parts of the state [1]. Utah County has reported 93 cases, Salt Lake County 62, and the Central Utah Public Health Department area (Juab, Millard, Piute, Sanpete, Sevier, and Wayne counties) has 50 [1].

Of the 583 confirmed cases, 485 patients — 83% — were unvaccinated [1]. Fifty-nine were vaccinated (so-called "breakthrough" infections, roughly 10% of cases), and 39 had unknown vaccination status [1]. Children are contracting the virus at nearly twice the rate of adults, with 194 of the cases in the southwest region alone involving people under 18 [10]. Forty-seven people statewide have been hospitalized, with 27 of those hospitalizations occurring among children in the southwest region [1][10].

The Vaccination Gap

The fundamental condition enabling this outbreak is a vaccination rate well below the threshold needed for herd immunity. Measles is among the most contagious diseases known — a single infected person can transmit it to 12–18 others in a susceptible population — and epidemiologists estimate that 95% MMR (measles, mumps, rubella) vaccination coverage is required to prevent sustained transmission [11].

Utah's kindergarten MMR vaccination rate for the 2024–2025 school year stands at 88.6%, below the 92.5% national average and far short of the 95% benchmark [11]. In Washington County, the epicenter, only 79.2% of kindergartners are vaccinated — a 16-percentage-point gap from herd immunity [11]. Even Salt Lake County, at 92.6%, falls short [11].

Source: CDC / Utah DHHS

Data as of Apr 10, 2026CSV

Utah now has the nation's second-highest rate of vaccine exemptions among kindergartners [12]. Approximately 10% of in-person kindergarten students in Utah hold an MMR exemption [9]. The biggest increase has been in religious exemptions, though only one faith in Utah — with a small footprint — formally opposes vaccination [13]. On the exemption request form itself, vaccine safety is the most commonly cited concern [13].

How Utah Compares to Other Outbreaks in Undervaccinated Communities

The pattern of measles exploiting pockets of low vaccination is not new. In 2014, an outbreak among Amish communities in Ohio produced 383 cases, with 89% among unvaccinated individuals and estimated MMR coverage of just 14% in affected households [14]. In 2025, a West Texas outbreak centered in undervaccinated Mennonite communities grew to 762 cases, with 99 hospitalizations and two child deaths [15].

Utah's outbreak shares the same core dynamic: a tightly knit, insular community with low vaccination rates provides the initial fuel, and the virus then spreads outward to the broader population. The Texas outbreak demonstrated how quickly that progression can happen — from 58 cases in the initial cluster to over 700 spanning multiple counties [15].

Why Utah, Why Now: Policy and Structural Factors

Several converging factors created the conditions for an outbreak of this scale in Utah specifically.

Permissive exemption laws. Utah allows medical, religious, and personal belief exemptions for school-required vaccines. Parents must complete an online educational module before obtaining a non-medical exemption — a requirement that a Utah House committee voted to preserve in a close 6–6 vote, after a bill sought to remove the training requirement [16]. However, Utah SB 13, enacted separately, exempts students attending home-based "microschools" or microeducation programs from school immunization requirements entirely [16].

Post-COVID immunization gaps. National kindergarten MMR coverage dropped from 95.2% in the 2019–2020 school year to 92.7% by 2023–2024 [4]. In Utah, the decline was steeper. The COVID-19 pandemic disrupted routine childhood immunization schedules, and many families never caught up [8]. In the conservative, religious communities of southwest Utah, the pandemic also eroded trust in public health institutions, with some parents describing the government's COVID response as "overbearing" [13].

Limited enforcement. Utah's immunization rule, last amended in February 2024, outlines vaccine requirements by grade level and procedures for exemptions and conditional enrollment [16]. But enforcement varies by school district, and children enrolled in microschools face no immunization requirements at all [16].

The Voices of Vaccine-Hesitant Parents

The reasons parents in affected communities decline the MMR vaccine are more varied than public discourse often suggests.

Safety concerns rank as the most frequently cited reason on Utah's exemption forms [13]. The debunked 1998 study linking the MMR vaccine to autism — retracted by The Lancet and repudiated by extensive subsequent research — continues to influence parental perceptions [17]. Fear of autism remains a leading reason parents refuse MMR vaccination for their children, according to a systematic review published in Vaccines [17].

Institutional distrust has deepened since the COVID-19 pandemic. Parents in southwest Utah have described feeling that public health authorities were dismissive of their concerns during COVID, and that experience hardened their skepticism toward all government health recommendations [13]. "There hasn't been any sense of alarm or living life differently," David Heaton of the Southwest Utah Public Health Department told NBC News, describing the community's posture toward the ongoing outbreak [8].

Religious conviction plays a role for some families, though the relationship is more complex than a blanket doctrinal opposition to vaccination. The FLDS community's wariness of outside institutions — a stance rooted in decades of conflict with government authorities — extends to the medical establishment [8]. The mainstream Church of Jesus Christ of Latter-day Saints does not oppose vaccination, and its leaders have publicly encouraged members to get vaccinated [13].

Some parents frame their decision in terms of bodily autonomy and parental rights — a position that has gained political traction across the ideological spectrum in the post-COVID era [17]. Public health officials have generally responded by emphasizing the safety data supporting the MMR vaccine, but critics argue the messaging has been insufficiently responsive to specific parental concerns, relying on assertion of consensus rather than engagement with individual questions [17].

The Economic Burden

Measles outbreaks are expensive, and the costs fall unevenly.

The Association of State and Territorial Health Officials (ASTHO) estimates the average cost of a measles outbreak to public health agencies at $766,014, with a range from under $1,000 for a quickly contained single case to over $10.6 million for a large, sustained outbreak [18]. The average cost per case is approximately $43,204, encompassing contact tracing, surveillance, quarantine, and vaccination campaigns [18]. An outbreak triggers roughly $244,480 in fixed investigation costs before a single contact is traced [18].

At the national level, the 2025 measles resurgence carried an estimated $244 million price tag [19]. If current trends continue, researchers project annual costs could climb to $1.5 billion by 2030, with cumulative costs over five years reaching $7.8 billion [20]. The largest cost component is the public health response itself — approximately $2.3 million per major outbreak for surveillance and contact tracing — followed by productivity losses (approximately $1.0 million) as parents miss work and children miss school, and then direct medical costs (approximately $76,000) [18].

For Utah specifically, precise outbreak cost figures have not been published. But with 583 cases and 47 hospitalizations, the state's costs are substantial. Each hospitalized measles patient adds thousands in direct medical costs, which are absorbed by a mix of private insurers, Medicaid (for uninsured or low-income children), and hospital systems that may not recover the full cost of treatment [20]. County and state health departments bear the contact tracing and surveillance burden, often redirecting staff from other public health programs — an opportunity cost that does not appear on any balance sheet [18].

No court has established liability for schools or institutions that admitted unvaccinated children who later contracted or transmitted measles. Existing law generally shields schools that follow state exemption procedures, though legal scholars have noted this area remains largely untested [18].

What Comes Next: The 60-to-90-Day Outlook

Several factors will determine whether Utah's outbreak remains contained or seeds transmission chains in other states.

Travel. Spring break travel in March 2026 was flagged by public health officials as a risk for geographic spread [21]. Measles is infectious for four days before the characteristic rash appears, meaning travelers can unknowingly carry the virus across state lines. Utah's exposure sites already include schools, churches, and retail locations in multiple counties [9].

Vaccination response. MMR vaccine administrations in Utah have increased 31% compared to the same period last year [11]. Whether this is sufficient to close the immunity gap — particularly in the hardest-hit southwest communities, where demand for vaccines has not surged despite available clinic capacity — remains an open question [8].

Other vulnerable states. Vaccination coverage among U.S. kindergartners has declined from 95.2% in 2019–2020 to 92.7% in 2023–2024 [4]. States with coverage below the national average and active anti-vaccine movements face elevated risk. Idaho (23 cases in 2026), Arizona (71 cases), and Washington state (31 cases) — all bordering or near Utah — are already reporting measles activity [6]. The CDC has identified 33 jurisdictions with confirmed cases in 2026 [3].

Institutional capacity. CDC staffing reductions have slowed laboratory and analytical work needed to determine whether U.S. outbreaks represent continuous endemic transmission or separate importation events [7]. Local health departments, many of which saw budget cuts during and after the pandemic, are stretched thin. The Southwest Utah Public Health Department did not hold its first media briefing on the outbreak until March 5, 2026 — roughly eight months after the first cases — and has not engaged on social media since the outbreak began [8].

The realistic trajectory depends heavily on whether affected communities accept vaccination at higher rates. In the 2014 Ohio Amish outbreak, community leaders eventually embraced a mass vaccination campaign that administered over 10,000 MMR doses and helped bring the outbreak under control [14]. In southwest Utah, that shift has not yet occurred. Until it does, the virus will continue to find susceptible hosts — in Utah and beyond.

Limitations of Available Data

Several data gaps constrain this analysis. Utah's county-level case data is reported by public health jurisdiction, which does not always align neatly with county boundaries. The state's cost figures for outbreak response have not been publicly disclosed. Vaccination rates are reported for kindergartners, which serves as a useful proxy but does not capture coverage in older children, adolescents, or adults. And the CDC's determination of whether the U.S. has lost measles elimination status — a consequential policy finding — remains pending, with no firm timeline beyond "2026."