Canadian tourist visited King, Snohomish Counties with measles. Were you exposed?
- A measles case involving a Canadian resident was confirmed in King County after the person traveled and was infectious from April 30 to May 3, 2025.
- This case is distinct from two earlier instances this year involving individuals from outside Washington who were infectious while passing through King County.
- The infected person visited multiple public locations in King and Snohomish counties, including Renton, Seattle, Bellevue, Everett, Woodinville, and Seattle-Tacoma International Airport.
- Measles is highly contagious and airborne, spreading through coughs and sneezes, with symptoms appearing 7 to 21 days post-exposure and up to 9 out of 10 unprotected contacts likely to be infected.
- Public Health advises individuals at exposure locations to verify immunity, noting the measles vaccine is safe, effective, and two doses provide about 97% long-lasting protection, while the general public risk remains low.
16 Articles
16 Articles


U.S. health officials issued a warning after a Canadian came to visit
The local public health office in Seattle is warning residents there of a confirmed case of measles in a Canadian resident who spent time in the region two weeks ago. The notice from Public Health — Seattle and King County says the person spent time in King and Snohomish counties between April 30 and May 3 while infectious, and adds that their vaccine status is unknown. (The Seattle metropolitan area overlaps with three counties — King, Snohom…
Officials in West Coast state sound alarm after traveler diagnosed with highly contagious viral disease
A Canadian traveler who was contagious with measles visited several public places in the Seattle area, prompting Washington state health officials to urge vaccination checks.
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