Measles case tied to traveler at Sea-Tac prompts exposure alerts

Public Health – Seattle & King County warns of a confirmed measles case linked to a Canadian traveler who passed through Seattle-Tacoma International Airport on March 9, with unknown vaccination status; the infected person is no longer in King County, and exposure potential spans March 16–20. Residents who are not immune or unsure of their vaccination status who were at the airport on March 9 are urged to review exposure details. Washington has 28 measles cases reported in 2026 so far.