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Positive Neurologic Herpesvirus Horse in Orange County, California

A horse in Orange County, California, was confirmed with neurologic herpesvirus.

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Publish date:: Apr 16, 2018

California Orange County map — Orange County, California, is the site of the most recent equine herpesvirus positive in California.
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On April 13, 2018, the California Department of Food and Agriculture (CDFA) confirmed equine herpesvirus myeloencephalopathy (EHM) in a 17-year-old Thoroughbred gelding originating from an Orange County facility. The gelding was displaying neurologic signs and has been isolated offsite and placed under quarantine.

Exposed horses will be monitored for clinical signs and temperatures will be taken twice daily. Any horse displaying a fever or compatible clinical signs will be tested.

CDFA staff is onsite and will continue to monitor the situation.

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A gelding was euthanized due to neurologic equine herpesvirus in Santa Barbara County, California, in early January.

California Sonoma County map

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A neurologic warmblood mare in Sonoma County, California, tested positive for equine herpesvirus with 40 horses exposed.

California Orange County map

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The third confirmed case of EHM at the Orange County facility is in quarantine.

California San Bernardino County map

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A private facility had two horses confirmed with neurologic equine herpesvirus and 22 others exposed.

California Sonoma County map

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

California Alamea County map

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A pony mare was confirmed positive with the neurologic form of equine herpesvirus in Alameda County, California.

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An aged Quarter Horse mare was confirmed positive for neurologic herpesvirus in Santa Clara County, California.

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