Neurologic Herpesvirus in Sonoma County, California

A warmblood mare on a premises with 48 other horses was confirmed with neurologic herpesvirus in early April.

A 10-year-old warmblood mare on a premises with 48 other horses was confirmed with neurologic herpesvirus. iStockPhotos.com

UPDATE 8-12-21: No additional cases or clinical signs at the Sonoma County event center or the Sacramento County origin premises have been reported. The parameters of positive horses receiving 2 negative tests 7 days apart has been met so the quarantine on the Sacramento County origin premises has been released.

The California Department of Food and Agriculture (CDFA) reported a confirmed case of neurologic equine herpesvirus in Sonoma County. There are 48 exposed horses on the premises.

The confirmed neurologic herpesvirus case was in a 10-year-old warmblood mare that had onset of clinical signs on April 6 that included ataxia, dribbling urine, nasal discharge and fever. She was confirmed on April 8 and was affected and alive at the time of this report.

The mare is quarantined and isolated at a referral hospital where she is receiving care. The Sonoma County home premises containing 48 horses is quarantined with enhanced biosecurity measures and twice daily temperature monitoring of all horse. CDFA will continue to oversee these quarantines.

Information for this report was provided by the Equine Disease Communication Center.

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