“On Monday, Dec. 18, the adolescent went to Children’s Hospital Colorado’s Emergency Department at the Anschutz Medical Campus from 8:30 to 11 a.m. The hospital is notifying healthcare providers, patients and others who were in a similar area as the measles patient,” the release said.

Arapahoe County Public Health is leading the investigation and has been notifying people who may have been directly exposed, according to the Colorado Department of Public Health and the Environment (CDPHE).

An adolescent who traveled through Denver International Airport earlier this month has tested positive for measles, according to the Colorado Department of Public Health. (Fox News)

The CDPHE also provided a timeline of when the adolescent was at the airport.

According to the timeline, the adolescent was at Denver International Airport from 4:30 to 8 p.m. on Dec. 13 with possible exposure to people moving through Concourse A, bridge security, baggage claim and the passenger pickup area, the release said.

Colorado has not reported a measles case since January 2019 prior to this outbreak. (iStock)

The last confirmed case of measles in a Colorado resident before this was in January 2019, according to the state.

Denver International Airport was not immediately available for comment.