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Disease Outbreak Alerts

Updates on current disease outbreaks are listed here 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.



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Alert ID: 1232
April 20, 2019
Clark County, NV
Confirmed case(s): Official Quarantine
Source: Nevada State Veterinarian

Number Confrmed: 1;
Number Exposed: 80;
Age: 10; Gender: Gelding; Breed: Not Reported; Onset of Clinical Signs: Not Reported;
Clinical Signs: Not Reported; Confirmation Date: 04/19/2019; Horse Status: Recovering; Vaccination Status: ;Vaccinated;
Notes: On April 19th the Nevada State Veterinarian was notified of a horse testing positive on a sample collected April 17th for EHV-1 Non-neuropathogenic strain. This most recent case is a 10-year-old gelding that was present at a national reigning event in Clark County, Nevada. This is the second Nevada horse to test positive after being at the National Reined Cow Horse Association (NRCHA) Stallion Stakes. The gelding was vaccinated and is not showing neurologic signs. He is recovering with treatment. The entire Clark County facility has been placed under quarantine by the Nevada Department of Agriculture and there are an estimated 80 horses at this premise. More updates will follow related to this outbreak. Two facilities under quarantine were release on April 20th. More updates on this most recent case and other will be made available as needed. ;

Alert ID: 1231
April 18, 2019
Livingston County, NY
Quarantine Released
Source: New York Department of Agriculture and Markets

The New York State Department of Agriculture and Markets, Division of Animal Industry released Leg Up Stables from EHV-1 quarantine on April 17th, 2019.

Alert ID: 1230
April 18, 2019
St Lawrence County, NY
Quarantine Released
Source: New York Department of Agriculture and Markets

The New York State Department of Agriculture and Markets, Division of Animal Industry released St. Lawrence University Stables from EHV-1 quarantine on April 17th, 2019.

Alert ID: 1229
April 17, 2019
Glassock County, TX
Confirmed case(s): Official Quarantine
Source: Texas Animal Health Commission

Number Affected: 1;
Age: 16; Gender: Mare; Breed: Quarter Horse
Clinical Signs: Neurologic Signs - Noticeable; Onset of Clinical Signs: 4/14/2019; Confirmation Date: 4/16/2019; Horse Status: Quarantined

Notes: The positive horse attended a seven-day event at the Brazos County Expo center in Bryan, Texas starting on April 1. Following the event, the horse attended a three-day barrel racing event at the Taylor County Expo Center in Abilene, Texas starting on April 12. At that time, the expo center was also hosting a Region II High School Rodeo. The premises where the horse originates is under quarantine and the positive horse is under the care of a Brazos County veterinary hospital. The horse was quarantined after showing signs of ataxia and other neurologic signs consistent with EHM.

Alert ID: 1228
April 16, 2019
Lenawee County, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

Number Affected: 1;
Age: 14; Gender: Mare; Breed: Arabian; Onset of Clinical Signs: 4/12/2019;
Clinical Signs: Fever, Nasal Discharge; Confirmation Date: 4/13/2019; Horse Status: Euthanized; Vaccination Status: Not Reported;
Notes: The horse was acquired by the current owner in Mid-March. The horse became ill shortly after arriving at the owner's farm. The owner elected to euthanize the horse as the horse also had concurrent lameness.;

Alert ID: 1227
April 15, 2019
Caribou County, ID
Confirmed case(s): Official Quarantine
Source: Idaho Department of Agriculture

Number Affected: 1;

Number Exposed: 10;
Age: 24; Gender: Mare; Breed: Pony; Onset of Clinical Signs: 4/5/2019;
Clinical Signs: Appetite Loss, Depression, Mild Nasal Discharge, Nystagmus, Recumbency, Unable to Stand, Mild Ocular Discharge; Confirmation Date: 4/12/2019; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
Notes: None;

Alert ID: 1226
April 10, 2019
Montgomery county, TX
Confirmed case(s): Official Quarantine
Source: Texas Animal Health Commission

Number Affected: 1;
Age: 14; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 4/5/2019;
Clinical Signs: Neurologic signs- Moderate; Confirmation Date: 4/9/2019; Horse Status: Affected And Alive; Vaccination Status: Not Reported;
Notes: The positive horse attended a reining event in Ardmore, Oklahoma the week of March 18, 2019. TAHC staff has been in contact with the Oklahoma State Veterinarian to ensure event participants were notified and enhanced biosecurity measures are taken. Since the Oklahoma event, the horse has not traveled to any other event and is under the care of a Brazos County veterinary hospital. The horse was quarantined after showing signs of ataxia and other neurologic signs consistent with EHM. While the risk of exposure to the virus was likely low at the event, owners of horses potentially exposed are encouraged to take precautions. Owners should work with their veterinary practitioners to establish appropriate monitoring and diagnostic plans for any potentially exposed horse(s).;

Alert ID: 1225
April 10, 2019
York Municipality and District of Cochran, ON
Confirmed Case(s): Voluntary Quarantine
Source: Ontario Ministry of Agriculture, Food, and Rural Affairs

Location: Municipality of York, Ontario, Canada

Number Affected: 1;
Age: Senior; Gender: Gelding; 
Clinical Signs: Neurologic Signs- Severe; Confirmation Date: 4/2/2019; Horse Status: Euthanized; Vaccination Status: Not Reported;
Notes: On April 2, 2019 the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a confirmed case of equine herpes myeloencephalopathy (EHM) due to equine herpes virus-1 (EHV-1) at a facility with both competition and resident horses in the Regional Municipality of York. An unvaccinated senior gelding was euthanized after developing sudden and severe neurological signs. The facility owner’s veterinarian is advising the owner on movement restrictions and biosecurity.;

Location: District of Cochran, Ontario, Canada

Number Affected: 1;
Clinical Signs: intermittent fever; Horse Status: Affected And Alive; Vaccination Status: Not Reported;
Notes: A second horse, which had been stabled at the same facility in the Municipality of York for a short period of time prior to returning to the District of Cochrane, has since developed intermittent fevers and has also tested positive for EHV-1. The owner of the second affected facility has placed that premises under a voluntary quarantine.;

Alert ID: 1224
April 10, 2019
Clark County, NV
Confirmed case(s): Official Quarantine
Source: Nevada State Veterinarian

Number Affected: 1;
Age: 7; Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: Neurological Signs; Horse Status: Recovering; Vaccination Status: Undervaccinated;
Notes: The mare is responding to treatment. The facility with a total of 10 horses has been placed under quarantine. Indirect exposure to junior high and collegiate rodeo horses has occurred and participants in these events are encouraged to continue to closely monitor their horses for signs of disease and to contact their veterinarians immediately if disease is suspected. Traveling to competitions should be done after consultation with veterinarians and strict biosecurity protocols should be in place at all events. ;

Alert ID: 1223
April 10, 2019
Bay County, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

Number Affected: 1;
Age: 10; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 4/1/2019;
Clinical Signs: Fever, Nasal Discharge, Reluctance to Move Head; Confirmation Date: 4/5/2019; Horse Status: Recovering;