Health authorities in Colorado identified measles in a Weld County infant who was ineligible for the standard measles, mumps, and rubella (MMR) vaccine due to age. The child had returned from international travel to a region experiencing active measles transmission, the Colorado Department of Public Health and Environment (CDPHE) and Weld County Health Department reported.
The recent case of an infant with measles highlights the vulnerability of babies under 12 months, who rely on those around them and travel precautions for protection since vaccines aren’t yet an option. Health officials identified six potential exposure periods at a family clinic in Evans and two hospitals in Greeley between October 21 and October 28.
Exposure Sites in Evans and Greeley
People may have been exposed at the Monfort Family Clinic in Evans on Wednesday, Oct. 21, from 7:40 to 10:15 a.m., and at UCHealth Greeley Hospital on Oct. 21 from 8:55 a.m. to 2:40 p.m. and on Friday, Oct. 23, from 3 to 5:26 p.m.
The other exposure windows are at Banner North Colorado Medical Center in Greeley, where the emergency department was an exposure site on Sunday, Oct. 25, from 8:30 to 11:50 a.m. and again from 4:25 to 9:32 p.m. The inpatient pediatric unit was an exposure site from 8:40 p.m. Oct. 25 through 10:15 a.m. Wednesday, Oct. 28.
Following the 21-day monitoring guideline, individuals exposed on October 21 should remain vigilant for symptoms until around November 11, while those exposed on October 23 should do so until about November 13. The CDPHE will provide updates on its website if additional exposure locations are identified.
Infants and the Gap Before the First MMR Dose
The CDC typically advises the first MMR vaccination between 12 and 15 months, with the second dose given between 4 and 6 years. Infants under 12 months are at heightened risk for severe measles complications, such as pneumonia and brain swelling. The CDC suggests an early MMR dose for infants aged 6 to 11 months before international travel.
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Since babies under 6 months cannot usually receive the vaccine, their safety depends on the immunity of those around them, including family and caregivers. This is why exposure in pediatric and emergency settings requires careful monitoring, as other vulnerable children may have been present.
As of November 4, the CDPHE reported 27 measles cases in Colorado for the year, with six in Weld County. Nationally, the CDC confirmed 4,852 measles cases by late October 2026, the highest annual total in 35 years.
Colorado’s Measles Year So Far
Weld County faced a previous measles case in 2026 when an April cluster linked to close contacts raised Colorado’s total to 16. Officials noted then that nearly all cases involved unvaccinated individuals.
Of these national cases, 96% occurred in people who were unvaccinated or had unknown vaccination status. Travel-related cases continue to seed new local clusters across the country. This total represents the highest yearly number in 35 years.
Steps for Northern Colorado Families
Anyone who was at an exposure site and develops symptoms should call CDPHE at 720-653-3369 or their local public health agency. They must also call a clinic or emergency room before arriving so staff can prevent further spread.
