A measles case has been confirmed in King County and the person spent time througout King and Snohomish counties between April 30 and May 3. While their vaccine status is unknown, the individual was infectious during the aforementioned dates.

King County Public Health Insider reported the case on Tuesday, May 13, saying that the person, a Canadian resident, traveled through Seattle-Tacoma International Airport and visited many public locations in Renton, Seattle, Bellevue, Everett and Woodinville. They were not diagnosed with measles until after traveling through the two counties.

According to Public Health, this measles case is not related to the two other measles cases this year where non-Washington state residents who traveled through King County were doing so while infected with measles.

The measles virus can remain in the air for up to two hours after someone infectious with measles leaves the area.

Those who do not know their vaccination status or are not immune to measles are encouraged to review the following locations of potential exposure:

• 9 a.m. on April 30 through 10 a.m. on May 3: The Residence Inn Northeast/Bothell 11920 NE 195th Street, Bothell

April 30

• Noon to 3:30 p.m. – LA Fitness Bellevue 15053 Main Street, Bellevue
• 2 to 5 p.m. – Bellevue Market Place at Factoria Shopping Center 14625 Northeast 20th Street, Bellevue
• 4 to 8 p.m. – Chateau Ste. Michelle Winery 14111 Northeast 145th Street, Woodinville
• 6 to 8:30 p.m. – Home Depot Redmond 17777 Northeast 76th Street, Redmond

May 1

• 11:30 a.m. to 2:30 p.m. – Dunn Lumber, Renton 120 Factory Avenue North, Renton
• 2 to 5 p.m. – Genki Sushu Renton 365 South Grady Way Suite B, Renton
• 3 to 6 p.m. – Topgolf Renton Sports Bar and Restaurant 780 Logan Avenue North, Renton

May 2

• Noon to 3:30 p.m. – LA Fitness Kirkland 12321 120th Place Northeast, Kirkland
• 1:30 to 4 p.m. – Pho Mignon Kirkland 12557 116th Avenue Northeast, Kirkland
• 2:30 to 4:45 p.m. – Kobo at HIGO Art Gallery and Shop in the International District 604 South Jackson Street, Seattle
• 3 to 5:30 p.m. – Uwajimaya Seattle Asian Market 600 5th Avenue South, Seattle

• 4 to 8 p.m. – Stoup Brewing Capitol Hill 1158 Broadway, Seattle
• 6:15 to 10 p.m – Spicy Style of Sichuan 13200 Aurora Avenue North, Seattle
• 8:30 to 11:30 p.m. – Columbia Super Range Fitness Center

May 3

• 8:30 a.m. to 1:30 p.m. – Seattle-Tacoma International Airport S Concourse (Gate S1)

What to do in case of a potential exposure to this measles case

Public Health says that, while risk to the general public is low, anyone who was in the aforementioned locations of potential exposure to measles should do the following:

• Find out if you have been vaccinated for measles or have had measles previously. Make sure you are up-to-date with the recommended number of measles (MMR) vaccinations.

• Call a healthcare provider promptly if you develop an illness with fever or with an unexplained rash. To avoid possibly spreading measles to others, do not go to a clinic or hospital without calling first to tell them you want to be checked for measles after an exposure. It is also important to limit contact with others, especially those without known immunity.

Anyone who was at the locations at the times listed above and are not immune to measles, the most likely time to have become sick would be between May 7 to 24, 2025. People who are immuno-compromised may take longer to experience symptoms.

What is the measles virus?

“Measles is a highly contagious and potentially severe disease that causes fever, rash, cough, runny nose, and red, watery eyes. If one person has it, up to 9 out of 10 people nearby will become infected if they are not protected. It mainly spreads through the air after a person with measles coughs or sneezes.

Measles symptoms begin 7 to 21 days after exposure. Measles is contagious from about 4 days before the rash appears through 4 days after the rash appears. People can spread measles before they have the characteristic measles rash.

Measles can lead to ear infections, diarrhea, pneumonia, and rarely, encephalitis (brain inflammation) or death.

Complications from measles can happen even in healthy people, but those at highest risk include infants and children under 5 years, adults over 20 years, pregnant people, and people with weakened immune systems from medications or underlying disease.

If you are in one of these high-risk groups and were exposed to measles at one of these locations, be sure to contact your health care provider to discuss any steps you need to take to protect yourself or loved ones against complications from measles.

Measles is preventable with the safe and highly effective measles, mumps and rubella (MMR) vaccine. Two doses of the MMR vaccine are about 97% effective at preventing measles and that protection is long lasting.”

For more information, visit kingcounty.gov/measles.