Colorado officials have confirmed the first case of measles in a state resident in five years.

The patient is an adolescent who traveled abroad to several countries, returning to Denver International Airport on Dec. 13, according to the state health department. It’s the first confirmed measles case in a Colorado resident since January 2019.

Measles is highly contagious for those who have not been vaccinated. The virus spreads in the air and can remain airborne for up to two hours. Symptoms, including fever, cough and runny nose, typically start one or two weeks after a person is exposed, though it could take three weeks. Two days after those initial symptoms begin, people get a rash that typically starts at the hairline and spreads down the body.

State health officials were warning unvaccinated people who were at Denver International Airport between 4:30-8 p.m. Dec. 13 or at Children’s Hospital Colorado’s emergency room on the Anschutz Medical Campus in Aurora between 8:30 a.m.-11 a.m. Monday. The hospital planned to notify patients and families who were in a similar area at the same time.

“Anyone who is experiencing symptoms of measles should stay home unless they need medical treatment,” Dr. Rachel Herlihy, Colorado state epidemiologist, said in an emailed news release. “People with signs and symptoms of measles should also not go to child care facilities, school, work, or other public places to avoid exposing others to this very serious and highly contagious disease.”

Read more at The Colorado Sun.