Revision History

Colorado's first measles outbreak of 2026, centered on two Broomfield schools, has grown to 10 confirmed cases across four counties, with exposure sites stretching from Denver International Airport to suburban restaurants and churches. The outbreak — occurring entirely among unvaccinated individuals aged 5 to 17 — underscores deepening cracks in the state's immunization infrastructure as the U.S. faces its worst measles surge in over three decades and risks losing its measles elimination status.