According to a statement issued by a spokesperson for the department, Villanueva is experiencing mild symptoms.
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"Regrettably, the Sheriff has tested positive for Covid. He has mild symptoms but is in good spirits," read the statement.
It's unclear how Villanueva may have contracted the virus.
The 59-year-old is vaccinated against COVID, though it's unclear if he has received a booster shot.
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Villanueva is currently running for reelection.
After a tight race in the June 7 primary election, he's headed to a November runoff against retired Long Beach Police Chief Robert Luna.
The sheriff has long battled the Los Angeles County Board of Supervisors on multiple issues, including a vaccine mandate in his department.