Source: Oklahoma State Veterinarian
Love County, OK – Equine Herpesvirus- Neurologic
Confirmed Case(s) – Official Quarantine
Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Comments: Horse is from Texas, being treated in Oklahoma, and has been diagnosed with EHM. Horse attended the WPRA in Waco and the BFA in Guthrie. Horse was displaying mild neurological signs when owner returned form the BFA and owner took the horse immediately to an Oklahoma Veterinary Clinic for treatment. Horse was only at Texas premises for a few hours when it came back from the BFA before returning to Oklahoma.;
For an up-to-date count of EHM cases tied to the Waco, Texas outbreak, please visit HERE
McClain County, OK – Equine Herpesvirus- Respiratory
Confirmed Case(s) – Voluntary Quarantine
Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Comments: Horse attended the WPRA in Waco. Horse had a fever on 11/13/25 or 11/14/25 with no other clinical symptoms. Sample was obtained on 11/19/2025 and results were reported on 11/25/2025. Only nasal swabs were positive for EHV-1 neuropath and non-neuropath. No other clinical signs reported since the fever.;
Logan County, OK – Equine Herpesvirus- Neurologic
Confirmed Case(s) – Outbreak Update
Number Confirmed: 2;
Number Suspected: Unknown;
Number Exposed: Unknown;
Number Euthanized: 1;
Comments: One of the horses associated with Alert ID 4719 was euthanized.;
Previous Alerts: 4719
Payne County, OK – Equine Herpesvirus- Neurologic
Confirmed Case(s) – Official Quarantine
Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Comments: Horse exhibited at the Lazy E Saturday Nov. 15th but did not attend the WPRA. Clinical signs are fever and neurological. DVM has diagnosed it as EHM.;
Oklahoma County, OK – Equine Herpesvirus- Respiratory
Confirmed Case(s) – Official Quarantine
Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Comments: Horse has displayed fever and respiratory signs only. Horse did not attend the WPRA or the BFA. Horse is stalled at same facility with positive horse associated with alert ID 4727.;
Payne County, OK – Equine Herpesvirus- Neurologic
Confirmed Case(s) – Official Quarantine
Number Confirmed: 1;
Number Euthanized: 1;
Comments: Horse was retested and did test negative for EHV-1 (nasal and blood). Original test was thought to be a weak positive. Horse was euthanized due to worsening chronic urinary tract issues.;
Previous Alerts: 4764
Oklahoma County, OK – Equine Herpesvirus- Neurologic
Confirmed Case(s) – Official Quarantine
Number Confirmed: 1;
Comments: Horse is displaying neurological clinical signs. The horse did not attend the WPRA or BFA but was stalled with horses that did, including one that tested positive for EHV-1 with only respiratory signs (Alert ID 4765);
Previous Alerts: 4785, 4764
For more information: https://www.equinediseasecc.org/equine-infectious-anemia
See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts
Updates on current disease outbreaks are listed on our EDCC website as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received. All information is sourced from: http://equinediseasecc.org/alerts/outbreaks