Breaking News
AAEP Publishes Viral Hepatitis Guidelines
Learn More

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.



Région Capitale Nationale, QC
Outbreak Identifier: 6727
Alert ID: 4212
February 04, 2025
Confirmed Case(s) - No Quarantine

MAPAQ

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Stable;

Muskegon County, MI
Outbreak Identifier: 6726
Alert ID: 4211
February 03, 2025
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture and Rural Development

Number Confirmed: 1; 

Horse 1: 
Age: 1; Gender: Filly; Breed: Standardbred; Clinical Signs: mandibular abscess; Confirmation Date: 1/31/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: Owner acquired the horse on January 28, 2025, and is unsure when the filly first became ill or if she could have been vaccinated against strangles.;

Alachua County, FL
Outbreak Identifier: 6725
Alert ID: 4210
February 03, 2025
Confirmed Case(s) - Official Quarantine

FDACS Veterinary Medical Officer

Number Confirmed: 2; 
Number Suspected: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 

Horse 1: 
Gender: Mare; Breed: Miniature Horse; Onset of Clinical Signs: 1/29/2025; Clinical Signs: Nasal discharge and fever; Confirmation Date: 1/31/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: This is Florida's 4th confirmed case of Strangles in 2025.;

San Bernardino County, CA
Outbreak Identifier: 6723
Alert ID: 4209
February 01, 2025
Confirmed Case(s) - Official Quarantine

California Department of Food and Agriculture

Number Confirmed: 2; 
Number Exposed: 35; 
Number Euthanized: 1; 

Horse 1: 
Age: 26; Gender: Mare; Breed: Paint; Horse Status: Euthanized; 

Horse 2: 
Age: 16; Gender: Gelding; Breed: Paint; Horse Status: Affected And Alive; 

Comments: A 26-year-old Paint mare and a 16-year-old Paint gelding from San Bernardino County displaying neurologic signs were confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1). The mare was euthanized due to severity of clinical signs and the gelding is alive and under supportive care at the home premises. Thirty-five (35) potentially exposed horses at the home premise in San Bernardino County were quarantined with enhanced biosecurity measures implemented. This premises shares a fence line with the other EHM quarantined premises. There has been no recent history of travel on or off these premises by the clinical horses. CDFA has been onsite and will continue to actively monitor the situation.;

San Bernardino County, CA
Outbreak Identifier: 6724
Alert ID: 4208
February 01, 2025
Confirmed Case(s) - Official Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Exposed: 90; 
Number Euthanized: 1; 

Horse 1: 
Age: 15; Gender: Gelding; Breed: Thoroughbred (TB); Horse Status: Euthanized; 

Comments: A 15-year-old Thoroughbred gelding from San Bernardino County displaying neurologic signs were confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 (EHV-1). The gelding was euthanized due to severity of clinical signs. Ninety (90) potentially exposed horses at the home premise in San Bernardino County were quarantined with enhanced biosecurity measures implemented. This premises shares a fence line with the other EHM quarantined premises. There has been no recent history of travel on or off these premises by the clinical horse. CDFA has been onsite and will continue to actively monitor the situation.;

San Luis Obispo County, CA
Outbreak Identifier: 6705
Alert ID: 4207
February 01, 2025
Quarantine Released

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Exposed: 40; 
Comments: No additional case was confirmed during the quarantine monitoring period. The quarantine period has been fully completed and is officially released.; 
Previous Alerts: 4186

Palm Beach County, FL
Outbreak Identifier: 6721
Alert ID: 4205
January 31, 2025
Confirmed Case(s) - Official Quarantine

FDACS Veterinary Medical Officer

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 

Horse 1: 
Age: 13; Gender: Mare; Breed: Warmblood (WB); Usage: Breeding; Clinical Signs: Nasel Discharge, Fever; Confirmation Date: 1/30/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: This is Florida's 3 confirmed strangles for 2025.;

Harris County, TX
Outbreak Identifier: 6720
Alert ID: 4204
January 31, 2025
Confirmed Case(s) - Official Quarantine

Texas Animal Health Commission

Number Confirmed: 4; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 4; 
Comments:  Premises quarantined December 10, 2024. Quarantines will not be released until TAHC’s requirements are met. TAHC staff work closely with the owners and local veterinarians to monitor potentially exposed horses and implement biosecurity measures.;

Wise County, TX
Outbreak Identifier: 6719
Alert ID: 4203
January 31, 2025
Confirmed Case(s) - Official Quarantine

Texas Animal Health Commission

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Comments: Premises quarantined December 4, 2024. Quarantines will not be released until TAHC’s requirements are met. TAHC staff work closely with the owners and local veterinarians to monitor potentially exposed horses and implement biosecurity measures.;

Wise County, TX
Outbreak Identifier: 6718
Alert ID: 4202
January 31, 2025
Confirmed Case(s) - Official Quarantine

Texas Animal Health Commission

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Comments: Premises quarantined December 11, 2024. Quarantines will not be released until TAHC’s requirements are met. TAHC staff work closely with the owners and local veterinarians to monitor potentially exposed horses and implement biosecurity measures.;