Skip to main content

KingCounty.gov is an official government website.

Official government websites use .gov
Website addresses ending in .gov belong to official government organizations in the United States.
Secure .gov websites use HTTPS
A lock or https:// means you've safely connected to the .gov website. Only share sensitive information on official, secure websites.
King County Washington home

April 1, 2026

Two measles cases associated with international travel in King County adults

➜ This health advisory is also available in PDF format (213 KB)

Actions requested

Be aware of two confirmed measles cases in King County residents who traveled internationally together.

  • Visit our measles website to view more specific information about potential areas of exposures within King County.
  • Secondary cases would most likely occur during March 28 – April 22, 2026.
  • MMR vaccination remains the most important tool for preventing measles.

Refer to Measles actions for Healthcare Providers for more details on immediate isolation, notification, testing, and management of patients with suspected measles, and verification of immunity status for all patients.