US EditionCanadian tourist visited King, Snohomish Counties with measles. Were you exposed?
- King County Public Health confirmed a measles case in a Canadian tourist infectious from April 30 to May 3, 2025, traveling through King and Snohomish counties.
- The individual’s vaccination status is unknown, and this case is unrelated to two earlier cases involving non-Washington residents who also traveled through King County while infectious.
- The tourist visited public locations including Seattle-Tacoma Airport, Renton, Seattle, Bellevue, Everett, and Woodinville, with measles spreading mainly through airborne particles that can remain in the air up to two hours.
- Measles is highly contagious, infecting up to 9 of 10 unprotected close contacts, with symptoms appearing 7 to 21 days after exposure and potentially causing severe complications including pneumonia or encephalitis.
- Public Health states the general risk is low but urges anyone exposed to check immunity, as the MMR vaccine is highly effective, providing about 97% long-lasting protection against measles.
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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.
·New York, United States
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