Measles Cases in Washington State 2025

This page will be updated when a new case is confirmed or potential exposure location identified.

  • All numbers are accurate as of Year-to-Date.
  • The most recent confirmed case was August 25, 2025.
  • All data are preliminary and subject to change.

  Washington State Cases in 2025 (Year-to-Date)

Total confirmed measles cases: 11

Age

  • Under 5 years: 5 (46%)
  • 5-17 years: 1 (9%)
  • 18+ years: 5 (45%)

Source of Infection

  • International travel related: 10 (91%)
  • US travel related: 0 (0%)
  • Unknown: 1 (9%)

  Washington State Outbreaks in 2025 (Year-to-Date)

Measles Outbreaks

  • There have been zero (0) outbreaks of measles.
  • An outbreak is defined as 3 or more related cases.

Measles Activity and Surveillance

Visit the Measles Notifiable Conditions page for measles reporting and testing resources.

View the Measles Cases and Outbreaks web page from the Centers for Disease Control and Prevention (CDC) to see measles cases reported in the United States.

County Media Releases

Washington measles cases and potential exposure locations

Additional potential exposure locations in Washington from travelers