2025 Colorado measles case information
Last updated: June 18, 2025
2025 Colorado measles cases by county
| County | Cases |
|---|---|
| Arapahoe | 5 |
| Archuleta | 1 |
| Boulder | 1 |
| Denver | 4 |
| El Paso | 4 |
| Pueblo | 1 |
| Total | 16 |
2025 Colorado measles cases by vaccination status
| Vaccination status | Cases |
|---|---|
| Vaccinated: 1 dose | 1 |
| Vaccinated: 2+ doses | 6 |
| Unknown/unvaccinated* | 9 |
| Total | 16 |
*The unknown/unvaccinated category includes people with no documented doses of measles vaccine more than 14 days before symptom onset.
2025 Colorado measles cases by age group
| Age group | Cases |
|---|---|
| 0-4 years | 3 |
| 5-17 years | 0 |
| 18+ years | 13 |
| Total | 16 |
2025 Colorado measles hospitalizations and deaths
| Hospitalizations | Deaths |
|---|---|
| 4 | 0 |
Outbreak linked to infectious traveler
Among Colorado’s cases, 10 are associated with an out-of-state traveler who flew while infectious. Four were passengers on the Turkish Airlines flight with the index case, five were at Denver International Airport during the exposure period, and one is a contact of a secondary case.