Measles Case Identified in King County Infant

Public health officials warn of potential exposure locations and urge vaccination

Apr. 11, 2026 at 1:52am

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Public Health - Seattle & King County has confirmed a measles case in a King County infant who may have exposed others to the virus at locations in Bellevue and Northeast Seattle, as well as on public transit. The infant had recently traveled internationally and was not yet vaccinated against measles.

Why it matters

Measles is a highly contagious disease that can lead to serious complications, especially in high-risk groups like infants, young children, pregnant individuals, and those with weakened immune systems. This case highlights the importance of maintaining high vaccination rates to prevent the spread of measles in the community.

The details

The infant was likely exposed to measles during recent international travel. Prior to this case, there have been 33 measles cases reported in Washington state in 2026. Public health officials are urging anyone who was at the identified exposure locations to check their measles vaccination status and contact a healthcare provider if they develop symptoms.

  • The infant was at the exposure locations on dates between April 10-29, 2026.
  • The most likely time for exposed individuals to become sick would be between April 10-29, 2026.

The players

Public Health - Seattle & King County

The local public health department that was notified of the measles case and is providing information to the community.

Dr. Sandra J. Valenciano

The Health Officer and Acting Director for Public Health - Seattle & King County, who is urging the public to check their measles immunity status before travel.

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What they’re saying

“Outbreaks have been happening in the U.S. and internationally. As you prepare for spring and summer travel, it's important to know your measles immunity status before you travel. Babies ages 6-11 months should get an early dose if traveling internationally or to places in the U.S. with current measles outbreaks.”

— Dr. Sandra J. Valenciano, Health Officer and Acting Director, Public Health - Seattle & King County

What’s next

Public health officials are urging anyone who was at the identified exposure locations to check their measles vaccination status and contact a healthcare provider if they develop symptoms.

The takeaway

This measles case in a King County infant highlights the importance of maintaining high vaccination rates in the community to prevent the spread of this highly contagious disease, especially among vulnerable populations.