EHM Confirmed in Montgomery County, Maryland, Horse

The neurologic horse was seen at a private veterinary clinic in Loudoun County, Virginia, before returning home to a private farm in Montgomery County, Maryland. The horse’s home facility has been quarantined.
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ehm confirmed in montgomery county maryland horse
In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected. | Photo: Kevin Thompson/The Horse

The Equine Disease Communication Center (EDCC) reported Sept. 22 that animal health officials have confirmed a case of equine herpesvirus myeloencephalopathy (EHM), the neurologic form of equine herpesvirus-1 (EHV-1), in a Montgomery County, Maryland, horse.

“On Sept. 21, the Maryland Department of Agriculture Animal Health Program confirmed a positive EHM case in a 12-year-old Warmblood gelding,” the EDCC said. “The neurological horse was seen earlier and treated as an outpatient on Sept. 21 at a private veterinary clinic Loudoun County, Virginia, before returning home to a private farm in Montgomery County, Maryland. A hold order placed on the farm the evening of Sept. 21.

“There are 18 horses on the farm in three barns,” the EDCC continued. “The positive gelding is isolated from all horses on the farm. The positive gelding was previously housed with four horses in one barn. The other two barns are more than 30 feet away from the exposed barn. Strict isolation and biosecurity protocols are in place at the exposed barn with body temperatures taken twice daily

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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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