Utah’s measles outbreak has slowed, but the start of school and colder weather in the fall may create another surge. ‘It’s still transmitting’

Utah's measles outbreak has slowed, but health officials warn of a potential fall surge due to the start of school and colder weather. Over 680 cases have been reported since June 2025, with the disease spreading across 22 counties, particularly in areas with low vaccination rates. The measles vaccine is 97% effective, but Utah's statewide vaccination rate of 87.2% remains below the 95% threshold needed to prevent outbreaks.