Measles Exposure Alert at Denver Airport and Littleton Church

The Colorado Department of Public Health and Environment, in conjunction with Arapahoe County Public Health, Denver Department of Public Health and Environment, and Denver International Airport, has issued a public health alert regarding potential measles exposures. An individual with a confirmed measles case traveled through Denver International Airport on February 21 and February 22, 2026, and attended services at St. Mary’s Catholic Church in Littleton on February 22. Passengers on specific Frontier flights and attendees of the church service between 9:30 a.m. and 2 p.m. on February 22 may have been exposed.

Individuals who were present at the identified locations during the specified times are advised to monitor for measles symptoms for 21 days following exposure, with the last possible day being March 16, 2026. They are instructed to contact a healthcare provider before visiting if symptoms develop. Free MMR vaccination clinics are being offered by Arapahoe County Public Health to mitigate transmission. While the traveler was vaccinated, the alert emphasizes the high contagiousness of measles and the importance of vaccination for those who are not immune.