Yolo County Health and Human Services Agency’s Public Health Branch has confirmed that a resident of West Sacramento has been diagnosed with measles. This is the 13th confirmed case of measles in California in this year. Prior to two cases reported in 2024 among Yolo County residents who traveled internationally, the county had not seen a measles case since 2015.

The affected adult, whose vaccination status is unknown, is experiencing mild illness and is recovering at home. The source of the infection is under investigation. The individual may have been exposed during recent air travel to a state without a known outbreak or may have contracted the virus locally.

While no additional local cases have been identified, measles has recently been detected in wastewater samples collected at the

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