On Jun. 9, 2025, the Colorado Department of Public Health and Environment, the Arapahoe County Public Health Department, and El Paso County Public Health have confirmed two cases of measles and are notifying members of the public of additional areas for potential measles exposures.

The first case involves a child under 5 from El Paso County who recently traveled with family to Ontario, Canada, where a measles outbreak is ongoing. The child was vaccinated with one dose of the measles, mumps, and rubella (MMR) vaccine.

The second case is in an unvaccinated Arapahoe County adult. The case was at Denver International Airport on Tuesday, May 13, during the exposure period of an out-of-state traveler who flew while infectious.

Getting vaccinated is the best way to protect yourself, your family, and your community. Measles is highly contagious and can sometimes lead to serious health problems, but it is a vaccine-preventable disease. Symptoms include fever, cough, runny nose, red eyes, and a characteristic rash that usually starts several days later on the face and spreads. The MMR vaccine provides strong protection. In rare breakthrough cases, they typically experience milder illness and are less likely to spread the virus to others.

People exposed to measles typically develop symptoms 7 to 21 days after exposure. If you were at these locations during the exposure window and develop symptoms, immediately contact your health care provider by phone. If you do not have a provider, call an urgent care center or emergency department and explain that you may have been exposed to measles.