Utah marks a year of fighting measles

Key Points:

• Utah has experienced a widespread measles outbreak since June 2025, with over 680 cases reported across 22 of its 29 counties, challenging containment efforts and potentially impacting the U.S.'s measles-free status.
• The outbreak has disproportionately affected undervaccinated communities, especially in southwestern Utah and the rural northeast "tricounty" region, where vaccination rates fall well below the 95% threshold needed to prevent outbreaks.
• Public health officials in Utah have implemented measures such as excluding unvaccinated students from in-person schooling and promoting vaccination, which helped mitigate spread despite ongoing vaccine hesitancy.
• Measles remains highly contagious and dangerous, particularly for vulnerable populations, but the vaccine is safe and highly effective; experts warn that the disease could surge again with the return of school and colder weather.
• International health authorities will meet in November to assess whether the U.S. has lost its measles elimination status, as ongoing outbreaks like Utah’s raise concerns about sustained local transmission.