EHM Confirmed in York County, Maine, Horse

A Standardbred horse at a private facility developed neurologic signs on May 10 and was subsequently euthanized.
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EHM
In many horses, the only sign of EHV-1 infection is fever, which can go undetected. | Photo: Kevin Thompson/The Horse

The Equine Disease Communication Center (EDCC) reported May 23 that a horse from York County, Maine, has been diagnosed with equine herpesvirus myeloencephalopathy (EHM), the neurologic form of equine herpesvirus-1 (EHV-1).

“One Standardbred horse showed an onset of clinical signs on May 10, including acute neurologic signs rapidly progressing to recumbency,” the EDCC said. “The case was confirmed with testing sent to the National Veterinary Services Laboratory, and a quarantine was initiated on May 15. The index case was euthanized and 12 horses remain in quarantine on the facility.”

Herpesvirus is highly contagious among horses and can cause a variety of ailments in equids, including rhinopneumonitis (a respiratory disease usually found in young horses), abortion in broodmares, and EHM. In many horses, the only sign of EHV-1 infection is fever, which can go undetected

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Written by:

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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