11/20/2025
ATTENTION CLIENTS!
There has been an outbreak of Equine Herpes Virus (EHV)/ Equine Herpes Myeloencephalopathy (EHM) in horses that were at\or associated with barrel racing and rodeo events in Texas and Oklahoma. Several cases of EHM have been confirmed in Texas and Oklahoma associated with these equine events, with numerous reports of additional cases and equine deaths pending investigation.
EHV‐1 is spread from horse to horse through contact with nasal discharge or spread as aerosol droplets. Infected horses may not show clinical signs of the virus but may still act as carriers. Horses can also contract the virus by coming into contact with contaminated surfaces such as stalls, water, feed, tack, and transport vehicles. People can spread the virus from horse to horse by contaminated hands, shoes, and clothing. It is important for owners to watch for signs and symptoms and practice biosecurity measures.
Good biosecurity practices include extensive cleaning and disinfection (a dilute bleach 1:10 ratio) of surfaces and equipment that come in contact with affected horses, and individuals who treat or come into contact with infected horses need to follow appropriate disinfection protocols when handling multiple horses.
There are currently no reported cases in SD, but there have been cases reported in neighboring states.
It is currently not recommended to travel with your horse at this time.
If your horse has travelled or been exposed, your horse should be isolated for 21 days after last known exposure.
Appropriate isolation includes no access to other horses (up to 25 feet between pens), avoiding the sharing of equipment or personnel, and utilization of protective barrier precautions.
Exposed horses should be monitored twice daily for elevated temperature (above 101.5*), respiratory signs (nasal discharge, coughing), and for clinical signs consistent with equine herpes myeloenceophalopathy (neurologic symptoms including inability to stand, difficulty walking, lethargy, and urine dribbling).
If elevated temperature, respiratory signs, or EHM-compatible clinical signs are noticed, contact your veterinarian.
If your horse has not been vaccinated in the last 6 months you can contact us to get a booster. Only vaccinate horses that have not already been exposed!
