Health officials are sounding the alarm after three cases of measles were detected at Denver International Airport.
An infected individual arrived at the airport on a Turkish Airlines flight on May 13 and stayed in a nearby hotel for two nights, potentially exposing hundreds of patrons.
The Colorado Health Department also confirmed two additional cases of measles on the flight, Turkish Airlines Flight 201.
One was a traveler who was infectious during the flight and the other a young child under five years old who was likely exposed on the plane.
The first passenger contracted measles despite being vaccinated. The child was unvaccinated and is currently hospitalized, while the vaccination status of the third passenger is unclear.
The health department warned anyone who was at Denver International Airport, which serves 226,000 passengers per day, on May 13 or 14 should monitor symptoms for 21 days and call their healthcare provider.
Measles is the most infectious disease in the world, with a patient able to infect nine out of ten unvaccinated people that are exposed.
Health officials issued an alert over three passengers with measles traveling through Denver International Airport (pictured here)
Measles, which causes a signature blotchy rash, has infected 1,000 Americans so far in 2025 (stock image)
Symptoms – which include a blotchy rash, fever, cough and runny nose – typically develop seven to 21 days after initial exposure.
Measles spreads via airborne droplets released in coughs and sneezes, which can hang in the air for up to two hours after a patient passes.
Read More Startling charts reveal how world’s most infectious disease is poised to engulf America 
It is particularly dangerous to young children, with the CDC saying one in 20 unvaccinated children who are infected develop pneumonia while one in 1,000 suffer deadly brain swelling.
Colorado has now detected seven total cases of measles.
There is renewed emphasis on measles this year amid a major outbreak in West Texas that is the countrys largest in two decades.
A total of 717 people have been sickened by the outbreak in Texas alone this year, with officials updating case tallies every Tuesday and Friday.
And the US has now crossed a grim milestone nationwide, with more than 1,000 measles cases being recorded — only the second time this threshold has been crossed since the disease was declared eradicated in 2000.
Two young girls, aged six and eight years, have also died from the disease.
Where infected passengers visited
Vaccinated adult
Casa Vallarta
4002 S. Parker Road, AuroraMay 22 between 5:30 p.m. and 8:30 p.m.
Colorado Athletic Club Denver Tech Center
5555 DTC Pkwy, Greenwood VillageMay 23 between 4 p.m. and 8 p.m.
Country Fair Garden Center
7150 Leetsdale Dr. #414, DenverMay 24 between 10:30 a.m. and 1:30 p.m.
Golden Saigon Restaurant
2648 S. Parker Road, Unit 2, AuroraMay 24 between 6:30 p.m. and 9:30 p.m.
Comfort Suites Golden West
29300 U.S. Hwy 40, EvergreenMay 25-May 26: 1 p.m. to 6 p.m. and 10:30 p.m. to 8:30 a.m.
Evergreen Wine and Liquor
29017 Hotel Way #105C, EvergreenMay 25 between 2:30 p.m. and 4:30 p.m.
Unvaccinated child
Childrens Hospital Colorado Emergency Department
13123 E. 16th Ave, Aurora, CO 80045Thursday, May 22, 6 to 10 p.m. and Monday-Tuesday, May 26 to 27
Walgreens
18461 E. Hampden Ave., Aurora, CO 80012Friday, May 23, 10 a.m. to 12:10 p.m. and Sunday, May 25, 10 a.m. to 12:10 p.m.
Sams Club
880 S. Abilene St., Aurora, CO 80012Sunday, May 25, Noon to 3:30 p.m.
Natural Grocers
3440 S. Tower Rd., Aurora, CO 80013Sunday, May 25, 6 to 8:10 p.m.
Adult, vaccination status unclear
Quality Inn and Suites Denver International Airport
6890 Tower Rd., Denver, CO, 80249Tuesday, May 13, 6:15 – 8:15 p.m.
