Utah becomes measles epicenter as outbreak spreads statewide amid growing vaccine skepticism

Utah is experiencing a major measles outbreak with 583 confirmed cases since last summer, making it the third-worst affected state after Texas and South Carolina. The outbreak began in Southwest Utah's remote communities near the Arizona border, where fundamentalist religious groups and low vaccination rates are prevalent, and has since spread statewide with exposures at schools and universities. 83% of Utah's measles cases are among unvaccinated individuals, with children affected at nearly twice the rate of adults. Public health experts attribute the crisis to growing vaccine skepticism, partly influenced by HHS Secretary Robert F. Kennedy Jr.'s policies, despite his April 6 endorsement of the MMR vaccine. The outbreak represents a reversal of measles elimination achieved in 2000, with three U.S. deaths recorded in 2025.

Spread and scale of Utah's measles outbreak

• ▪Measles exposures occurred at a high school wrestling tournament at Utah Valley University near Provo in February.
• ▪Utah has had 583 confirmed measles cases since last summer as of the most recent update from the Utah Department of Health and Human Services.
• ▪83% of confirmed measles cases in Utah are among unvaccinated people according to the Utah Department of Health and Human Services.
• ▪Children are outpacing adults in Utah measles cases by a near 2-1 margin.
• ▪Only Texas and South Carolina have had more measles cases than Utah.
• ▪Measles exposures occurred at Highland High School in Salt Lake City in February.
• ▪Salt Lake County announced in February that measles was actively spreading in the county.

Severity of measles cases and clinical impact

• ▪Three measles deaths were recorded across the United States in 2025.
• ▪Measles is more dangerous for children under 5 and people with weakened immune systems.
• ▪Measles was declared eliminated in the United States in 2000.
• ▪Measles experienced a surge in cases in the United States starting in 2025.
• ▪Dr. Leisha Nolen did not learn about measles during pediatrician training in the late 1990s and early 2000s because it was not expected to be seen in the United States.

Vaccine skepticism and erosion of public health trust

• ▪The University of Utah told students to stay home for 21 days if they feel sick or are not vaccinated due to the highly contagious nature of measles.
• ▪U.S. Health and Human Services Secretary Robert F. Kennedy Jr.'s rhetoric and new policies are fostering vaccine skepticism and confusion by not encouraging vaccination according to public health experts.
• ▪Robert F. Kennedy Jr. endorsed the MMR vaccine on April 6.
• ▪Trust in public health took a serious hit during the COVID years in the conservative, religious Southwest Utah region where the measles outbreak started.
• ▪Communities in Southwest Utah near the Arizona border where the outbreak started are known for being affiliated with a fundamentalist religious sect and have low vaccination rates.

Perspective of Southwest Utah communities near Arizona border

• ▪David Heaton has spent six years working to disseminate accurate vaccine information to the public in Southwest Utah.
• ▪Trust in public health declined significantly during the COVID years in the conservative, religious Southwest Utah region.

Perspective of University of Utah administration

• ▪The University of Utah responded to a confirmed measles case being on campus for at least four days at the end of March.

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