Breaking News
Latest EHV-1 Outbreak Information and Resources
Read

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
El Paso County, CO
Outbreak Identifier: 4649
Alert ID: 2033
April 14, 2021
Confirmed Case(s) - Official Quarantine

State Veterinary Office

Number Confirmed: 2;
Number Exposed: 8;
Notes: On April 9, 2021 the Colorado Department of Agriculture, State Veterinarian’s Office was notified of a potential Equine Herpesvirus Type 1 (EHV-1) case in El Paso county from a private practicing veterinarian. The case had originally presented with a fever of unknown origin on April 4th. After several days with no resolve of clinical symptoms, the clinician submitted a respiratory panel, which came back positive for EHV-1. The index horse was stabled at a farm with 35 horses. After being made aware of the potential for EHV-1 in the index horse, the stable manager began to monitor temperatures on the other horses in the barn. Seven additional febrile horses on the premises were identified from April 7th-9th. A veterinarian submitted samples from a second horse on the premises, which also tested positive for EHV-1. Additionally, one of the febrile horses on the index premises began to show neurological signs on April 11th indicative of Equine Herpes Myeloencephalopathy (EHM). The State Veterinarian’s Office was made aware that a group of horses from the index premises and additional barns in the county had recently traveled together to attend an equine event in Scottsdale, Arizona from 03/14 - 03/29. An additional horse on a second premises that had traveled to and from the show was also found to be febrile. That horse developed neurological signs on April 12th, consistent with EHM. Both premises are under quarantine and are being monitored by the State Veterinarian’s Office and their private practicing veterinarians. A third associated premises that also transported horses to the same event is under a hold order. That premises has had no febrile horses or clinical signs consistent with EHV-1. The Colorado State Veterinarian’s Office has been communicating with the Arizona State Veterinarian where the show was hosted to provide notification to other event attendees. For more information about EHM go to https://equinediseasecc.org/Content/ContentDocs/DiseaseFactsheet-EHM.pdf;

Equine Herpesvirus- Neurologic
Woodford County, KY
Outbreak Identifier: 4614
Alert ID: 2032
April 13, 2021
Quarantine Released

Kentucky Office of the State Veterinarian

Number Confirmed: 6;
Number Exposed: 27;
Facility Type: Training Facility;
Age: 3; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: Not Reported;
Clinical Signs: Ataxia, Febrile; Confirmation Date: Not Reported; Horse Status: Exposed; Vaccination Status: Not Reported;
Notes: Update April 13, 2021; Original Alert ID#- 1982; 1988; 1992, 2019: Results of testing on the samples (Nasal Swabs and Whole Blood EDTA) collected from each horse stabled in Barn A at Blackwood Training Center on Friday, April 9th have been reported negative for detection of EHV1 DNA by PCR testing. In addition to the testing that has been completed, the horses have been monitored daily and our findings support that it has been greater than 14 days since any horse in Barn A was last potentially exposed to a clinical case. Meeting the criteria above the group of horses have been released in Barn A from restriction on Monday April 12 and are allowed to resume their normal training and racing activities.

Equine Herpesvirus- Neurologic
Northumberland County, ON
Outbreak Identifier: 4646
Alert ID: 2030
April 09, 2021
Confirmed Case(s) - Voluntary Quarantine

Ontario Ministry of Agriculture and Food

Number Confirmed: 1;
Facility Type: Boarding Facility;
Age: 24; Gender: Mare; Breed: Draft-cross; Onset of Clinical Signs: 3/31/2021;
Clinical Signs: Ataxia, Difficulty urinating; Confirmation Date: 4/6/2021; Horse Status: Recovering; Vaccination Status: Not Reported;
Notes:
The affected horse is being treated at a referral hospital. No other horses on the property are showing clinical signs. Under veterinary supervision, the facility manager has instituted biosecurity protocols and animal movement restrictions. For more information about EHM go to https://equinediseasecc.org/Content/ContentDocs/DiseaseFactsheet-EHM.pdf;

Equine Herpesvirus- Neurologic
Santa Clara County, CA
Outbreak Identifier: 4627
Alert ID: 2025
April 08, 2021
Quarantine Released

California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 91;
Facility Type: Boarding Facility;
Age: 21; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: Not Reported;
Clinical Signs: Ataxia, Painful Neck, proprioceptive deficits in hind end; Confirmation Date: 3/24/2021; Horse Status: Affected And Alive; Vaccination Status: Not Reported;
Notes: Update 4/7/21: Original Alert ID: 2002: No additional cases to report. As there were additional cases for fourteen (14) days on the home premises, the quarantine was released. ;

Equine Herpesvirus- Neurologic
Putnam County, NY
Outbreak Identifier: 4613
Alert ID: 2024
April 07, 2021
Quarantine Released

New York Department of Agriculture and Markets

Number Confirmed: 2 EHM, 6 EHV-1
Number Exposed: 35;
Facility Type: Stable;
Onset of Clinical Signs: 3/7/2021;
Confirmation Date: 3/10/2021; Horse Status: Affected And Alive; Vaccination Status: Not Reported;
Notes: Update 4/7/21: Original Alert ID: 1981: The New York State Department of Agriculture and Markets is releasing an EHM quarantine that was placed on a private stable that is located in Brewster, NY. In total, 2 EHM cases and 6 EHV-1 cases were diagnosed during the quarantine. Fortunately all affected horses have survived. ;

Equine Herpesvirus- Neurologic
Woodford, KY
Outbreak Identifier: 4614
Alert ID: 2019
April 03, 2021
Outbreak Update

Kentucky Department of Agriculture

Number Confirmed: 6;
Number Exposed: 27;
Facility Type: Training Facility;
Age: 3; Gender: Mare; Breed: Thoroughbred (TB); Clinical Signs: Ataxia, Febrile;  Horse Status: Exposed; Vaccination Status: Not Reported;
Notes: Update April 3, 2021; Original Alert ID# 1982; 1988; 1992: Blackwood Training Center Woodford County Kentucky: Results of testing on the samples (Nasal Swabs and Whole Blood EDTA) collected from each horse stabled in Barn B on Wednesday, March 31 have been reported negative for detection of EHV1 DNA by PCR testing. In addition to the testing that has been completed, the horses have been monitored daily and our findings support that it has been greater than 14 days since any horse in Barn B was last potentially exposed to a clinical case. Meeting the criteria above provided us the confidence needed to release the group of horses in barn B from restriction and allowed them to resume their normal training and racing activities beginning on Friday, April 2nd. Barn A at Blackwood: Daily monitoring of the horses stabled in Barn A continues. There have been no additional fevers or other symptoms in the group, and we have tentatively scheduled the horses in Barn A to be sampled (nasal swabs and whole blood) and tested by PCR later next week. 

Equine Herpesvirus- Neurologic
Los Angeles County, CA
Outbreak Identifier: 4611
Alert ID: 2018
April 02, 2021
Quarantine Released

California Department of Food and Agriculture

Number Confirmed: 1;
Number Suspected: Not Reported;
Number Exposed: 42;
Facility Type: Boarding Facility;
Age: 20; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 3/6/2021;
Clinical Signs: Ataxia, Dribbling Urine, forelimb ataxia, grade 2 front limb ataxia, Grade 3 hindlimb ataxia, Hind limb ataxia, Partial paraphimosis; Confirmation Date: 3/9/2021; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;
Notes:  Update 4/2/2021; Original Alert ID# 1980: There were no additional cases on the home premises and the index horse met the parameters of two (2) negative tests seven (7) days apart. Quarantine has been released.

Equine Herpesvirus- Neurologic
Davis County, UT
Outbreak Identifier: 4612
Alert ID: 2017
April 02, 2021
Quarantine Released

Utah State Veterinarian

Number Confirmed: 1;
Number Suspected: 2; 
Facility Type: Private Facility;
Notes:  Update 4/2/2021; Original Alert ID# 1989: The quarantine on the positive EHV-1 premise has been released. It has been more than 21 days since the last horse had a fever. All other facilities tested negative.

Equine Herpesvirus- Neurologic
Parker County, TX
Outbreak Identifier: 4638
Alert ID: 2016
April 01, 2021
Confirmed Case(s) - Official Quarantine

Texas Animal Health Commission

Number Confirmed: 1;
 Breed: Quarter Horse (QH); 
Confirmation Date: 3/25/2021; 
Notes: The Texas Animal Health Commission (TAHC) received confirmation of equine herpes myeloencephalopathy (EHM), the neurologic disease linked to equine herpesvirus (EHV-1), in a Parker County quarter horse on March 25,2021. The premises has been quarantined and TAHC staff are working closely with the owner and local veterinarian to monitor the infected horse and enforce biosecurity measures on the premises. The positive horse has not recently attended any events or known to have come in direct contact with horses from other premises. This is the first positive detection of EHM in Texas this year. For more information about EHM go to EHM Factsheet.  

Equine Herpesvirus- Neurologic
Duval County, FL
Outbreak Identifier: 4636
Alert ID: 2015
March 31, 2021
Confirmed Case(s) - Official Quarantine

Florida Department of Agriculture and Consumer Services

Number Confirmed: 2;
Number Exposed: 20;
Facility Type: Boarding Facility;
Age: Not Reported; Gender: Not Reported; Breed: Not Reported; Onset of Clinical Signs: 03/28/21;
Clinical Signs: Not Reported; Confirmation Date: 03/30/21 Horse Status: Affected and Alive; Vaccination Status: Vaccinated;
Notes: A single horse with neurological signs was reported by a private veterinary practitioner in Duval County on March 28, 2021. Test results completed March 30, were positive for EHV-1. The horse is currently being treated at a separate isolation facility. A second febrile horse on the premises has tested positive for EHV-1, but currently has no neurologic signs. The Division of Animal Industry has placed a quarantine on the premises and an investigation is ongoing. There is no known epidemiologic link between the horses on the Duval County premises and the positive cases reported in early March in Marion County. Visit //www.FDACS.gov/ai for additional information. ;