Outbreaks | Equine Disease Communication Center

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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Equine Herpesvirus- Respiratory

Dane County, WI

Outbreak Identifier: 7848

Type: EHV-4

Alert ID: 5420

November 10, 2026

Confirmed Case(s) - Voluntary Quarantine

Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1;
Facility Type: Private Facility;

Horse 1:
Age: 7; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/26/2026; Clinical Signs: Fever, mild lethargy, moderate serous nasal discharge, occasional cough; Confirmation Date: 10/14/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;

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Equine Influenza

Outagamie County, WI

Outbreak Identifier: 7847

Alert ID: 5419

November 10, 2026

Confirmed Case(s) - Voluntary Quarantine

Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

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

Horse 1:
Age: 8; Gender: Gelding; Breed: Arabian; Onset of Clinical Signs: 9/28/2026; Clinical Signs: Fever, lethargy, mucoid nasal discharge; Confirmation Date: 10/3/2026; Horse Status: Recovered; Vaccination Status: Vaccinated;

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Strangles

Shawano County, WI

Outbreak Identifier: 7846

Alert ID: 5418

November 10, 2026

Confirmed Case(s) - Voluntary Quarantine

Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 2;
Number Exposed: Unknown;

Horse 1:
Age: 4; Gender: Stallion; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/24/2026; Clinical Signs: Fever, nasal discharge; Confirmation Date: 9/29/2026; Horse Status: Recovered; Vaccination Status: Status Unknown;

Horse 2:
Age: 7; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/24/2026; Clinical Signs: Fever, nasal discharge; Confirmation Date: 9/29/2026; Horse Status: Recovered; Vaccination Status: Status Unknown;

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Strangles

Marion County, FL

Outbreak Identifier: 7845

Alert ID: 5417

November 09, 2026

Confirmed Case(s) - Official Quarantine

Source: Florida Department of Agriculture and Consumer Services

Number Confirmed: 1;
Number Suspected: 2;
Number Exposed: 10;
Facility Type: Private Facility;
Comments: This is the 30th confirmed case of strangles for Florida in 2026.;

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West Nile Virus

Osceola County, FL

Outbreak Identifier: 7844

Alert ID: 5416

November 06, 2026

Confirmed Case(s) - No Quarantine

Source: Florida Department of Agriculture and Consumer Services

Number Confirmed: 1;
Number Exposed: Unknown;
Comments: This is the 5th confirmed case of WNV for Florida in 2026.;

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West Nile Virus

Williamson County, TN

Outbreak Identifier: 7841

Alert ID: 5415

November 05, 2026

Confirmed Case(s) - No Quarantine

Source: Tennessee Department of Agriculture

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

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West Nile Virus

Jefferson County, IN

Outbreak Identifier: 7840

Alert ID: 5414

November 05, 2026

Confirmed Case(s) - No Quarantine

Source: Indiana State Board of Animal Health

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 15; Gender: Mare; Breed: Haflinger; Onset of Clinical Signs: 10/13/2026; Clinical Signs: 4-limb ataxia; stumbling; muscle fasciculations; dragging front and rear hooves but also hypermetric in rear limbs; afebrile; CBC/Chem was normal; Confirmation Date: 10/27/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;