Two More Orange County Horses Test Positive for EHV-1

The index case–a 17-year-old Thoroughbred gelding diagnosed with EHM, the neurologic form of EHV-1–remains quarantined and isolated offsite and continues to show clinical improvements.
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EHV-1
In many horses, the first sign of EHV-1 infection is fever, which can go undetected. | Photo: Stephanie L. Church/The Horse

The California Department of Food and Agriculture (CDFA) reported that two additional horses in residing at the Orange County facility quarantined for equine herpesvirus-1 (EHV-1) tested positive for the disease last week.

“A mare displayed a fever the morning of April 17 and a horse which was febrile for one day on Sunday, April 8,” have tested positive, the CDFA said on its website. “Both horses have been placed in separate quarantine isolation stabling on the property. All exposed horses under quarantine continue to be monitored and have temperatures taken twice daily.”

The index case—a 17-year-old Thoroughbred gelding that was diagnosed with equine herpesvirus myeloencephalopathy (EHM, the neurologic form of EHV-1) after developing neurologic signs of disease—remains quarantined and isolated offsite and continues to show clinical improvements, the CDFA said

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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