EHM
In many horses, the only sign of EHV-1 infection is fever, which can go undetected. | Photo: Courtesy Peterson and Smith Equine Hospital

The California Department of Food and Agriculture (CDFA) has reported that two more horses residing at a quarantined facility in Orange County have tested positive for equine herpesvirus-1 (EHV-1).

On April 27, the agency reported a new case of equine herpesvirus myeloencephalopathy (EHM, the neurologic form of EHV-1). “A 24-year-old mare from the quarantined barn … displaying neurological signs has tested positive for equine herpesvirus-1. Based on clinical signs and the detection of EHV-1 virus, the horse has been classified as a case of EHM. The mare has been moved to onsite isolation stabling.”

Then, on April 29, the agency reported that a 9-year-old mare from the quarantined barn displayed neurologic signs on disease and subsequently tested positive for EHV-1. She has been moved to an on-site isolation stable. Because the mare exhibited neurologic signs, the CDFA classified the case as EHM

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