The newly identified case was a person who lived in the same household as a Denver baby diagnosed with measles earlier this month.

The second case of measles has been confirmed in Denver, according to city and county health officials, bringing the total number of confirmed cases in Colorado to four.Health officials didn't provide many details about the latest case in Denver,

Colorado recorded its first case of 2025 in an adult in Pueblo County on March 31. A second case was confirmed in Denver in an infant about a week later. Both were unvaccinated. The third case was in Archuleta County, in south-central Colorado, in an adult with an unknown vaccination history.