A West Sacramento resident has a confirmed case of measles, health officials say, prompting a contact tracing effort in Yolo County.

The Yolo County Health and Human Services Agency announced the case on Friday, noting that it was California's 13th confirmed case so far in 2025.

Contact tracing was underway after health officials learned that the person with measles had visited Sutter Davis Hospital recently. Patients, visitors and staff who were at the hospital emergency room from May 31 to June 1 between 10:12 p.m. and 1:42 a.m., along with June 2 between 2:42 p.m. and 1:23 a.m., are being contacted.

Health officials are still investigating where the West Sacramento resident contracted measles.

"This case of measles in our community is a good reminder that while international travele

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