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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.



West Nile Virus
Placer County, CA
Outbreak Identifier: 6326
Alert ID: 3804
July 26, 2024
Confirmed Case(s) - No Quarantine

California Department of Food and Agriculture

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 6; Gender: Stallion; Breed: Andalusian Cross; Onset of Clinical Signs: 7/17/2024; Clinical Signs: ataxia, muscle fasciculations in muzzle, grinding teeth, decreased appetite; Confirmation Date: 7/25/2024; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: The first (1st) case of West Nile Virus in California in 2024 was confirmed in Placer County. On July 25, 2024, a 6-year-old Andalusian cross stallion in Placer County with an unknown vaccine history displaying neurologic signs was confirmed positive for West Nile Virus. The stallion is alive and recovering.;
Potomac Horse Fever
Montgomery County, MD
Outbreak Identifier: 6325
Alert ID: 3803
July 26, 2024
Confirmed Case(s) - No Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Stable;
West Nile Virus
Harper County, OK
Outbreak Identifier: 6324
Alert ID: 3802
July 26, 2024
Confirmed Case(s) - No Quarantine

State Veterinarian

Number Confirmed: 1; 
Facility Type: Farm; 

Horse 1: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/18/2024; Clinical Signs: Incoordination/ataxia in all four limbs.; Confirmation Date: 7/25/2024; Horse Status: Recovering; Vaccination Status: Unvaccinated;
Eastern Equine Encephalitis
Levy County, FL
Outbreak Identifier: 6323
Alert ID: 3801
July 26, 2024
Confirmed Case(s) - No Quarantine

FDACS Veterinary Medical Officer

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

Horse 1: 
Age: 7; Gender: Mare; Breed: Dutch Harness Horse; Onset of Clinical Signs: 7/4/2024; Clinical Signs: Depression, incoordination, Weakness in hind limbs, Inability to stand, listlessness; Confirmation Date: 7/25/2024; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Comments: This is Florida's 19th confirmed case of EEE for 2024;
West Nile Virus
Frederick County, MD
Outbreak Identifier: 6322
Alert ID: 3800
July 25, 2024
Confirmed Case(s) - No Quarantine

Maryland Department of Agriculture

Number Confirmed: 1; 

Horse 1: 
Horse Status: Recovered; Vaccination Status: Vaccinated;
Equine Influenza
King County, WA
Outbreak Identifier: 6321
Alert ID: 3799
July 25, 2024
Confirmed Case(s) - No Quarantine

State Veterinarian Office.

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: Boarding Facility; 
Comments: Under vet care and facility is taking biosecurity precautions. Horse is secluded away from others.;
West Nile Virus
Nye County, NV
Outbreak Identifier: 6320
Alert ID: 3798
July 24, 2024
Confirmed Case(s) - No Quarantine

The Nevada Department of Agriculture

Number Confirmed: 1; 
Number Euthanized: 1;
West Nile Virus
Clark County, NV
Outbreak Identifier: 6319
Alert ID: 3797
July 24, 2024
Confirmed Case(s) - No Quarantine

The Nevada Department of Agriculture

Number Confirmed: 1; 
Number Euthanized: 1;
Strangles
Marion County, FL
Outbreak Identifier: 6318
Alert ID: 3796
July 24, 2024
Confirmed Case(s) - Official Quarantine

FDACS Veterinary Medical Officer

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

Horse 1: 
Age: 14; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 7/19/2024; Horse Status: Quarantined; Vaccination Status: Unvaccinated;

Comments: This is Florida's 35th confirmed case for 2024;
Strangles
Ionia County, MI
Outbreak Identifier: 6317
Alert ID: 3795
July 24, 2024
Confirmed Case(s) - Voluntary Quarantine

Michigan Department of Agriculture and Rural Development

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 

Horse 1: 
Age: 16; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 6/21/2024; Clinical Signs: runny nose; Confirmation Date: 7/19/2024; Horse Status: Recovering; Vaccination Status: Unvaccinated;