Back
World News

Utah Measles Outbreak Reaches 602 Cases; High Proportion of Unvaccinated Individuals Reported

Generated on: Last updated: 9 sources
View source

Measles Outbreak in Utah: 602 Confirmed Cases, Spread Continues

Utah health officials have reported a total of 602 confirmed measles cases as of Wednesday, tied to an outbreak that began last year. The outbreak, which originated in Texas over a year ago and has since spread to most U.S. states, marks the end of the period when measles was considered eliminated in the country.

85% of those infected (513 individuals) were not vaccinated against measles.

Recent exposures have been documented at several preschools and elementary schools. The state has also reported localized surges in its TriCounty region, and a subsequent decline in case numbers has been noted in recent weeks.

Statewide and Local Case Statistics

  • Total Cases: Utah has reported 602 measles cases since the outbreak began.
  • New Infections: 19 new infections were identified in the latest report.
  • Recent Activity: 405 cases have occurred since the beginning of the year, with 75 reported in the last three weeks.
  • Transmission Settings: Recent exposures have been reported at several preschools and elementary schools.
  • Hospitalizations: 49 individuals have required hospitalization.
  • Emergency Room Visits: Approximately one-third of those infected experienced symptoms requiring emergency room visits, largely due to dehydration from vomiting and diarrhea.
  • Vaccination Status: 513 people (85% of total cases) were not vaccinated against measles.

Cluster in TriCounty Health District

  • Localized Surge: The TriCounty Health Department (Daggett, Duchesne, and Uintah counties) confirmed a doubling of cases, from 23 to 56 infections within one week.
  • Statewide Ranking: The TriCounty health district is among the areas most affected by the outbreak, alongside southwest Utah, Utah County, and Salt Lake County.
  • Demographics: Approximately two-thirds of the reported cases statewide involve children under 18.

The TriCounty Health Department acknowledged individual rights regarding vaccination choices, while encouraging unvaccinated residents to research the benefits and risks of vaccines. In 2024, the department's board of health issued a letter warning of potential outbreaks among school-aged children due to low vaccination rates.

Outbreak Origins and Broader Context

  • National Origin: The outbreak began in Texas more than a year ago and has since spread to most states across the country.
  • Elimination Status: This spread marks the end of the period when measles was considered eliminated in the United States.
  • Demographics: Most cases have occurred in children, many of whom had not received the measles, mumps, and rubella (MMR) vaccine. Infants under one year old and children with certain health conditions remain at risk, even in communities with high vaccination rates.
  • Other Affected States: Large measles outbreaks have appeared in multiple U.S. states over the past year, including Texas and South Carolina.

Decline in Cases

"This decline is a really good sign, but rapid spread remains possible if one case enters a susceptible community." — Dr. Leisha Nolen, state epidemiologist

Later reports indicate a consistent drop in measles cases over a three-week period, with only four new diagnoses reported in one specific week. In the city of Vernal, measles vaccinations in March 2025 were four times higher than in March 2024.

Dr. Nolen described the outbreak as "unprecedented in Utah over the last 40 years."

Vaccination and Public Health Guidance

  • Statewide Coverage: Approximately 90% of Utah residents are vaccinated against measles.
  • Herd Immunity: Health experts note that about 95% vaccination coverage is typically needed to achieve herd immunity, which helps protect those who are not immunized.
  • Vaccine Effectiveness: The MMR vaccine offers the strongest protection. While the Utah measles dashboard indicates vaccination does not guarantee 100% protection, officials state the majority of cases are among unvaccinated individuals.
  • Recommendations: The Utah Department of Health and Human Services recommends early vaccination for children older than 6 months and an early second dose for children aged 1 to 5.

Legislative and Policy Context

  • Proposed Bill: State lawmakers introduced a bill earlier this year that would have made it easier for families to opt out of school vaccination requirements.
  • Outcome: The proposal did not pass.

Related Statements

Robert F. Kennedy Jr., Secretary of the U.S. Department of Health and Human Services, has described measles vaccination as a personal choice and has promoted treatments that have not been proven effective, according to news reports.