An international traveler to Colorado has tested positive for measles. The adolescent arrived at Denver International Airport on Dec. 13 and visited several counties in the state in the past week.

Arapahoe County Public Health is leading the investigation with state and other local public health agencies to notify those who have been directly exposed.

The adolescent arrived at DIA on Dec. 13 and there could have been possible exposures in the A Concourse, bridge security or baggage claim from 4:30 p.m. until 8 p.m. on that day.

The patient then went to the emergency department at Children’s Hospital Colorado on Monday morning. The adolescent has an unknown vaccination status and has been in isolation since Dec. 18.

The last confirmed case of measles in a Colorado resident was January 2019.