Measles alert: Infected visitor endangers King, Snohomish Counties

King County Public Health is warning that a Canadian visitor was contagious with measles while traveling to multiple places in King and Snohomish Counties.

That person stayed at a Residence Inn in Bothell from April 30 to May 3, before flying out through the Seattle-Tacoma International Airport. The individual visited restaurants, shops, businesses, and other public locations in Renton, Bellevue, Seattle, Everett, and Woodinville.

View the complete list below.

King County Public Health is alerting the public that a Canadian visitor was contagious with measles while traveling through various locations in King and Snohomish Counties. The infected individual visited the following public places before being diagnosed with measles. pic.twitter.com/BNTbqvCrE3

— MyNorthwest (@Mynorthwest) May 13, 2025

Doctors warn measles easily spread

Doctors say measles can be easily spread, often before a person knows they’re sick and has developed symptoms, which can include a fever, rash, cough, runny nose, and red, watery eyes.

If you contracted measles from the visitor, you are most likely to develop symptoms sometime between May 7 and 24. If you think you were exposed and have not been vaccinated—or don’t know your immunization status—call your health care provider.

Although this most recent measles case involves a visitor, five Washington residents have contracted measles this year.

“Globally and in the U.S., we are experiencing a significant measles resurgence,” said Meagan Kay, Medical Epidemiologist for Public Health Seattle and King County. “With over 1,000 cases reported so far this year nationally, 2025 is on track to have the highest number of measles cases in the US since the early 1990s.”

The measles vaccine is 97% effective at preventing infection and severe illness.

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