Measles exposure reported in Boulder County
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State health officials are warning Boulder County residents about several possible measles exposures last week.
The latest: The Colorado Department of Public Health and Environment confirmed one case in an international visitor who traveled through the Front Range this month.
Threat level: The person visited several locations in downtown Boulder and Lafayette.
- Avanti Food & Beverage Boulder, including its first floor and rooftop, from 7–11:30pm on Sept. 8.
- Gelato Boy West End on Pearl Street from 9:30–11:45pm on Sept. 8.
- Pearl Street Mall from about 9:45pm Sept. 8 through 12:30am Sept. 9.
- Good Samaritan Hospital's emergency department from 7:30–8:30pm on Sept. 11.
What to watch: Anyone at those locations during the exposure windows should monitor for symptoms for up to 21 days afterward.
- Measles typically begins with fever, cough, runny nose and red eyes, followed several days later by a rash that starts on the face and spreads down the body.
- Health officials say anyone who develops symptoms should call a medical provider before showing up for care to avoid exposing others.
By the numbers: Colorado has recorded 25 measles cases in 2026, including seven hospitalizations.
- A February outbreak centered in and around Broomfield schools grew to nine cases and prompted quarantines and contact tracing across the area.
Zoom out: This latest exposure comes amid a historic resurgence of measles nationally. The U.S. had recorded 3,294 confirmed cases as of Sept. 10 — surpassing the 2,289 cases in all of 2025.
Be smart: Boulder County Public Health says two doses of the measles, mumps and rubella vaccine are about 97% effective at preventing measles, while one dose is about 93% effective.