South Dakota Confirms EHM Case in Brookings

The affected 19-year-old Quarter Horse mare belongs to a college rodeo participant and recently traveled to events in the Great Plains Region.

No account yet? Register


In many horses, the only sign of EHV-1 infection is fever, which can go undetected. | Photo: Alexandra Beckstett/The Horse

The Equine Disease Communication Center (EDCC) reported May 3 that the South Dakota State Veterinarian has confirmed a case of equine herpesvirus myeloencephalopathy (EHM), the neurologic form of equine herpesvirus-1 (EHV-1), in a 19-year-old Quarter Horse mare exhibiting neurologic signs of disease.

“The horse belongs to a college rodeo participant and has extensive recent travel history to events within the Great Plains Region,” the EDCC said. “The horse has been isolated and voluntarily quarantined in Brookings, South Dakota, upon returning from an event in Hastings, Nebraska, the weekend of April 27-28. Owners of horses known to be directly exposed to the index horse are advised to restrict movement and monitor their horses for signs of illness, including twice daily temperature monitoring.”

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

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:

Has your veterinarian used SAA testing for your horse(s)?
69 votes · 69 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!