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immunization Branch​

Measles Activity in California, 2025

In 2025, 25 confirmed measles cases were reported. The affected jurisdictions were:

  • Contra Costa
  • Fresno
  • Long Beach
  • Los Angeles
  • Orange
  • Placer
  • Riverside
  • Sacramento
  • San Diego
  • San Luis Obispo
  • San Mateo
  • Santa Clara
  • Tulare
  • Tuolumne
  • Yolo
​​​Month of Rash Onset
​Number of Cases
​January 2025
​0
​February 2025
​3
​March 2025
​6
​April 2025
​2
​May 2025
​2
​June 2025
​4
​July 2025
​2
​August 2025
​1
​September 2025
​1
​October 2025
​1
​November 2025
​1
​December 2025
​2


These data are provisional and subject to change.
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