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Disease 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.


    

Equine Herpesvirus- Neurologic
Linn County, OR
Outbreak Identifier: 4875
Alert ID: 2231
September 10, 2021
Confirmed Case(s) - Official Quarantine

Oregon State Veterinary Office

Number Confirmed: 2;
Number Suspected: 1;
Age: 11; Gender: Gelding; Breed: Quarter Horse (QH); 
Clinical Signs: Severe hind-limb ataxia;  Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Age: 24; Gender: Mare; Breed: Quarter Horse (QH); 
Clinical Signs: Moderate hind-limb ataxia;  Horse Status: Affected and Alive; Vaccination Status: Unvaccinated;
Notes: For more information go to:  EHM factsheet

Equine Herpesvirus- Neurologic
Washington County, MN
Outbreak Identifier: 4853
Alert ID: 2213
September 03, 2021
Confirmed Case(s) - Official Quarantine

Minnesota Board of Animal Health

Number Confirmed: 1;
Number Exposed: 31;
Facility Type: Not Reported;
Age: 18; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/26/2021;
Clinical Signs: Ataxia, Recumbency; Confirmation Date: 9/2/2021; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
Notes: A private facility in Washington County is under official quarantine after one horse has tested positive for EHM. For more information about EHM go to: EHM factsheet. 

Equine Herpesvirus- Neurologic
Hunterdon, NJ
Outbreak Identifier: 4807
Alert ID: 2171
August 14, 2021
Confirmed Case(s) - Official Quarantine

New Jersey Department of Agriculture

Number Confirmed: 1;
Number Exposed: Not Reported;
Facility Type: Private Facility;
Age: 30; Gender: Mare; Breed: Not Reported; Onset of Clinical Signs: 8/8/2021;
Horse Status: Euthanized;
Notes: The New Jersey Department of Agriculture has quarantined a property in Hunterdon County after one horse developed the highly infectious equine herpes myeloencephalopathy (EHM). The horse, a 30-year-old mare, developed clinical signs on August 08, 2021, and was subsequently humanely euthanized. Other horses on the premises are under quarantine. Temperatures are also being taken twice daily on all quarantined horses to monitor for sickness. The NJDA is tracing and notifying the appropriate parties regarding recent horse movement. This is the second case of EHV-1 in New Jersey in 202. EHM factsheet

Equine Herpesvirus- Neurologic
Sonoma and Sacromento Counties, CA
Outbreak Identifier: 4776
Alert ID: 2166
August 12, 2021
Quarantine Released

California Department of Food and Agriculture

Number Confirmed: 7;
Number Suspected: 6;
Number Exposed: 0;
Facility Type: Showgrounds;
Notes:  Update 8/12/2021: original alerts 2139, 2141, 2145, 2146, and 2151; No additional cases or clinical signs at the Sonoma County event center or the Sacramento County origin premises have been reported. The parameters of positive horses receiving two (2) negative tests seven (7) days apart has been met so the quarantine on the Sacramento County origin premises has been released.

Equine Herpesvirus- Neurologic
Kentucky, KY
Alert ID: 2165
August 12, 2021
Information Only

Kentucky Department of Agriculture

Effective Sunday August 15th, Kentucky Department of Agriculture’s Office of State Veterinarian rescinds restrictions on horses originating from Saratoga Race Course. Horses from Saratoga that meet the standard health requirements for Kentucky tracks and training centers (including EHV1 vaccination, 72hr Certificate of Veterinary Inspection, and valid negative EIA test) will be allowed unrestricted entry.

 

Equine Herpesvirus- Neurologic
Sonoma County, CA
Outbreak Identifier: 4776
Alert ID: 2151
August 05, 2021
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 7;
Number Suspected: 6;
Number Exposed: 0;
Facility Type: Showgrounds;
Age: 6; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 7/23/2021;
Clinical Signs: Hind-end Weakness, limb edema, Nystagmus, Recumbency; Confirmation Date: 7/24/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;
Notes:
Update 8/5/21: Original Alert IDs: 2139, 2141, 2145 and 2146: A 14-year-old Warmblood gelding currently at the Sonoma County event premises displaying fever on August 4th was promptly isolated and subsequently confirmed negative for EHV-1 on August 4th. CDFA was onsite at the Sonoma County premises on August 4th. The two confirmed positive non-neurologic EHV-1 cases at the index premises, a 5-year-old Warmblood gelding and a 14-year-old pony mare, have both had a first negative test confirmed on August 4th. CDFA was onsite at the Sacramento County index premises on August 3rd. No additional cases or clinical signs have been reported. CDFA continues to actively monitor the situation.

Equine Herpesvirus- Neurologic
Saratoga County, NY
Outbreak Identifier: 4753
Alert ID: 2149
August 01, 2021
Quarantine Released

New York Racing Association and New York State Gaming Commission

Number Confirmed: 1;
Facility Type: Racetrack;
Notes:  Update 8-1-2021for the original alerts #2123 and 2130: The quarantine of Barn 86 for EHV-1 at the Saratoga racetrack is released. There have been no new cases.

Equine Herpesvirus- Neurologic
Sonoma County, CA
Outbreak Identifier: 4776
Alert ID: 2146
July 31, 2021
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 7;
Number Suspected: 6;
Facility Type: Showgrounds;
Horse #1--Age: 6; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 7/23/2021;
Clinical Signs: Hind-end Weakness, limb edema, Nystagmus, Recumbency; Confirmation Date: 7/24/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Horse #2--Age: 15; Gender: gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 7/22/2021;
Clinical Signs: Fever, neurological signs, ataxia, urine dribbling, cranial nerve deficits; Confirmation Date: 7/23/2021; Horse Status: Affected and Alive; Vaccination Status: Unknown ; 

Notes: Update 7/30/2021; Original alerts 2139; 2141; 2145; The additional 15-year-old Warmblood mare from the index premises that attended and was asymptomatic at the Sonoma County event and displayed mild neurologic signs on July 27th has had a confirmed second negative EHV-1 test 24 hours later and returned home to the index premises in stable condition and continues to recover. The three other neurologic horses in isolation at the offsite veterinary hospital are also alive in stable condition, and were retested on July 29th and/or July 30th, and confirmed negative for EHV-1. One additional horse at the index premises, a 5-year-old Warmblood gelding, that attended the Sonoma County event and remains asymptomatic was tested on July 28th and confirmed positive for EHV-1 on July 30th, and has been isolated at the index premises. No clinical signs from any additional horses from the Sonoma County event or the home premises have been reported at this time. CDFA was onsite on the index premises on July 29th and continues to actively monitor this situation. The total number of confirmed cases in this incident are: 1 (one) confirmed EHM case (EHV-1 positive with neurologic signs), 1 (one) confirmed asymptomatic EHV-1 case, and 1 (one) confirmed febrile-only EHV-1 case, and 4 (four) presumptive positive cases that were subsequently confirmed negative. In total, one (1) horse in this incident has been euthanized and the other affected horses are alive and currently recovering under veterinary care. For more information go to:  EHM Factsheet

Equine Herpesvirus- Neurologic
Sonoma County, CA
Outbreak Identifier: 4776
Alert ID: 2145
July 29, 2021
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 6;
Number Suspected: 4;
Facility Type: Showgrounds;
Age: 6; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 7/23/2021;
Clinical Signs: Hind-end Weakness, limb edema, Nystagmus, Recumbency; Confirmation Date: 7/24/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;
Notes: Update 7-29-21 Original Alert ID: 2139: One additional 15-year-old Warmblood mare from the index Sacramento county home premises who attended, and was asymptomatic at, the Sonoma county event displayed mild neurological signs and was transported to an offsite veterinary hospital in isolation on July 27th and confirmed negative for EHV-1 on July 28th. No additional horses from the Sonoma county event or the home premise have shown clinical signs at this time. CDFA continues to actively monitor this situation.;

Equine Herpesvirus- Neurologic
State of Kentucky, KY
Alert ID: 2143
July 28, 2021
Information Only

Kentucky Department of Agriculture

Saratoga EHV Quarantine- KY Update and Position 7/28/2021

Notes: Due to Kentucky’s inability to adequately isolate new arrivals on the grounds of Kentucky tracks and training facilities and out of an abundance of caution, additional requirements will be placed on horses from Saratoga Race Course requesting entry to Kentucky tracks and associated training centers after July 31st. Horses which have recently (since July 31st) been on the grounds at Saratoga can qualify for approval to enter a KY track or sanctioned training center, if they have documentation demonstrating they were off the grounds prior to July 31st OR have been tested by PCR after July 31st and reported negative for EHV-1 on both nasal swab and whole blood – EDTA samples. A Certificate of Veterinary Inspection for the horse(s) from the point where the sample was collected needs to be issued for movement to the Kentucky racing or training facility and must document the EHV1 testing and current health assessment in addition to meeting the normal entry requirements that includes EHV1 vaccination and EIA test certificate.