ehm in idaho
In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected. | Photo: Stephanie L. Church/The Horse

The Equine Disease Communication Center (EDCC) reported April 15 that the Idaho Department of Agriculture has confirmed a case of equine herpesvirus myeloencephalopathy (EHM), the neurologic form of equine herpesvirus-1 (EHV-1).

The 24-year-old pony mare began exhibiting clinical signs of disease on April 5, the EDCC said; she experienced appetite loss, depression, mild nasal discharge, mild ocular discharge, nystagmus (involuntary eyeball movement), recumbency (unable to stand). The mare was euthanized. Veterinarians confirmed she had EHM on April 12, the EDCC said.

The EDCC said 10 horses were exposed to the EHM-positive mare, and the farm on which they reside has been quarantined

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