04/22/2026
EHM (Equine Herpes Myeloencephalopathy) Update:
There are no known cases of EHM in North Carolina currently.
A Thoroughbred gelding began showing clinical signs consistent with Equine Herpes Myeloencepnalopathy while at the HITS Commonwealth National USEF horse show in Culpeper Co VA on April 17, 2026.
Clinical signs included lethargy, distal limb edema, and acute onset ataxia. This gelding was assessed onsite then transported to an equine hospital where it was received directly into the isolation unit. The gelding arrived recumbent and was euthanized.
42 horses from barn 5 at the event were quarantined either at home or on site.
13 more horses from the index farm in Loudoun Co VA are also under quarantine.
No horses trace back to NC from the quarantined barn and there are currently no horses quarantined in NC related to this outbreak.
This outbreak serves as a reminder of the potential disease risks associated with large commingling equine events. It underscores the importance of timely reporting of diseases and ensuring that movement requirements are followed, including veterinary inspection and health certificates prior to travel.
Owners of horses that may have been exposed to horses with EHM should work with their veterinarian to establish appropriate biosecurity and monitoring protocols such as:
Isolating the horses that attended the event for 21 days after known exposure.
Having the temperature of returning horses monitored twice daily for at least 14 days after the last known exposure. Fever greater than 101.5 may be the first indicator of disease.
Clean and disinfect tack, boots, equipment, and grooming supplies.
If elevated temperature, respiratory signs, or EHM-compatible clinical signs are noticed, contact your veterinarian.
When doing feeding and chores, work with the returning horses last, wear boots and coveralls, and remove them before working with your other horses.
Don’t forget to wash your hands!
Clinical Signs of EHM in Horses:
Fever
Lethargy
Nasal and/or Ocular discharge
Swelling of the legs
Lack of coordination
Hindlimb ataxia
Dribbling urine
Pe**le paralysis
Head tilt
Decreased tail tone
Abortion in pregnant mares
These symptoms are not specific to EHM. Diagnostic testing should be utilized to confirm EHV infection. If you suspect your horse is displaying symptoms consistent with an EHV-1 infection, contact your veterinarian immediately.
