Third 2025 Measles Case Confirmed in Denver Resident

Third 2025 Measles Case Confirmed in Denver Resident

Published on April 25, 2025

The Denver Department of Public Health & Environment (DDPHE), Colorado Department of Public Health & Environment, and Jefferson County Public Health have confirmed a case of measles in an adult in Denver who was seen at an urgent care facility in Lakewood, CO. The individual recently traveled to an area of Chihuahua, Mexico, which is experiencing an ongoing measles outbreak. The individual has verified vaccination records for MMR.

Because the individual has verified vaccination records, this case is considered a breakthrough case (when someone becomes infected after they have been vaccinated). Two doses of MMR vaccine are 97% effective at preventing measles, one dose is 93% effective. In rare cases, people who are vaccinated can still get measles-about three out of every 100-but their symptoms are usually milder, and they are less likely to spread it to others. Measles only spreads from people who show symptoms; it does not spread from people who aren't feeling sick.

Measles is highly contagious and can sometimes lead to serious health problems, but it is a preventable disease. The measles, mumps, and rubella (MMR) vaccine provides strong protection. Getting vaccinated is the best way to protect yourself, your family, and your community.

Known exposure locations:

Based on available information, anyone who was in the following location during the date and times listed may have been exposed to measles and should call their local public health department as soon as possible. Denver residents should call DDPHE at 720-865-5767.

Anyone exposed should monitor for symptoms for 21 days after exposure and consider avoiding public gatherings or high-risk settings. Monitoring for symptoms is especially critical for people who have not been vaccinated with the MMR vaccine. We will update the locations, as necessary. 

What to do if you may have been exposed and aren't feeling well:
People exposed to measles typically develop symptoms 7 to 21 days after exposure. Symptoms include fever, cough, runny nose, red eyes, and a characteristic rash that usually starts several days later on the face and spreads.

If you were at this location 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. Calling ahead helps prevent additional exposures.

Learn more about measles symptoms, how to protect yourself, and the MMR vaccine online.

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