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.

No account yet? Register


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

Create a free account with to view this content. is home to thousands of free articles about horse health care. In order to access some of our exclusive free content, you must be signed into

Start your free account today!

Already have an account?
and continue reading.


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.

Related Articles

Stay on top of the most recent Horse Health news with

FREE weekly newsletters from

Sponsored Content

Weekly Poll

sponsored by:

When do you vaccinate your horse?
308 votes · 308 answers

Readers’ Most Popular

Sign In

Don’t have an account? Register for a FREE account here.

Need to update your account?

You need to be logged in to fill out this form

Create a free account with!