Colorado Confirms 3 New Measles Cases, Pushing 2025 Total to 36

Overview

• State health officials confirmed an unvaccinated school-aged child in Weld County who developed symptoms after travel to a state with an ongoing outbreak, plus two unvaccinated household contacts in Montezuma County.
• Investigators determined the Weld County child did not go out in public during the contagious period, and the Montezuma contacts were already in quarantine.
• Colorado’s 2025 measles count stands at 36, the highest annual total since 1995, with five hospitalizations and no deaths reported.
• Authorities report no known public exposure locations tied to the three newest cases as contact tracing continues with 21-day symptom monitoring for contacts.
• Health guidance urges staying up to date on MMR vaccination, with post-exposure options that include MMR within 72 hours and immunoglobulin within six days for select situations.