The Seattle-King County Health Department says some people at Sea-Tac Airport may have been exposed to measles from another traveler on March 26.

A woman in her 20s flew from Amsterdam to Sea-Tac (on Northwest Flight 33) and then continued to Portland (on Horizon flight 2243). After developing a rash, she returned to the Netherlands on March 29 where a blood test on April 4 confirmed measles.

Health officials say other travelers who may have been on the flights and in the airport on the 26th should be alert for symptoms and see a doctor if they become ill.