A third case of measles in Colorado this year has been confirmed by state health officials. The Colorado Department of Public Health and Environment says an adult in southwestern Colorado has tested positive. The adult lives in Archuleta County, and it hasn’t been confirmed if the person is vaccinated or not.
Evidence is showing it’s likely not linked to the first two confirmed cases in 2025 in Colorado. Those cases are in Pueblo and in Denver.
This is the first time in more than a decade that the state has confirmed this many active measles cases at the same time.
Measles is caused by a highly contagious virus that’s airborne and spreads easily when an infected person breathes, sneezes or coughs. It is preventable through vaccines, and has been considered eliminated from the U.S. since 2000.