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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.



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The color range is based off of the selected End Date. If the End Date doesn't have a value it will use Today's Date.

Equine Herpesvirus- Respiratory
Douglas County, NE
Outbreak Identifier: 7425
Type: EHV-1
Alert ID: 4989
May 06, 2026
Confirmed Case(s) - No Quarantine

Attending Veterinarian

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

Horse 1: 
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Sales; Onset of Clinical Signs: 4/6/2026; Clinical Signs: Bought at sale about a month ago, has had a cough and snotty nose, started to develop swelling in limbs, sheath and odd spots on body. All four limbs stocked up and swollen up into forearms, petechiae inside muzzle and gums, not able to take temp, safe access in trailer is questionable; Confirmation Date: 5/6/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: Purchased at a sale in Iowa, transported to Nebraska.;
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Strangles, Equine Herpesvirus- Respiratory, Equine Rhinitis Viruses
Sauk County, WI
Outbreak Identifier: 7398
Type: EHV-4
Alert ID: 4950
April 11, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Exposed: 4; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 5; Gender: Mare; Breed: Morgan; Onset of Clinical Signs: 4/7/2026; Clinical Signs: Mucoid nasal discharge, occasional cough, lymphadenopathy, fever, decreased appetite; Confirmation Date: 4/9/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;

Comments: Also, PCR positive for EHV-4 and ERBV;
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Equine Influenza, Equine Herpesvirus- Respiratory
Washington County, NE
Outbreak Identifier: 7392
Type: EHV-4
Alert ID: 4944
April 09, 2026
Confirmed Case(s) - Voluntary Quarantine

Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: 10;
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Equine Herpesvirus- Respiratory
Maricopa County, AZ
Outbreak Identifier: 7362
Alert ID: 4911
March 08, 2026
Confirmed Case(s) - Official Quarantine

Arizona Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 32; 
Facility Type: Private Facility;
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Strangles, Equine Herpesvirus- Respiratory
Washington County, MD
Outbreak Identifier: 7352
Type: EHV-1
Alert ID: 4903
March 04, 2026
Outbreak Update

Maryland Department of Agriculture

Number Confirmed: 2; 
Number Exposed: 20; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 37; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 3/1/2026; Confirmation Date: 3/4/2026; Horse Status: Quarantined; Vaccination Status: Status Unknown;

Previous Alerts: 4899
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Equine Herpesvirus- Respiratory
Twin Falls County, ID
Outbreak Identifier: 7333
Alert ID: 4880
February 13, 2026
Confirmed Case(s) - No Quarantine

Attending veterinarian

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: 10; 
Facility Type: Private Facility; 

Horse 1: 
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Usage: training; Onset of Clinical Signs: 2/6/2026; Clinical Signs: fever, lethargic, nasal discharge; Confirmation Date: 2/12/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: PCR positive for EHV-4 
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Equine Herpesvirus- Respiratory
Manitowoc County, WI
Outbreak Identifier: 7330
Alert ID: 4878
February 10, 2026
Confirmed Case(s) - Voluntary Quarantine

Wisconsin Department of Agriculture, Trade and Consumer Protection

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 4; 
Facility Type: Private Facility; 

Horse 1: 
Age: Yearling; Gender: Filly; Breed: Draft; Clinical Signs: intermittent low-grade fever, mild intermittent respiratory signs since acquiring ~4 months ago; Confirmation Date: 2/2/2026; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
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Equine Herpesvirus- Respiratory
Cecil County, MD
Outbreak Identifier: 7324
Alert ID: 4873
February 08, 2026
Confirmed Case(s) - Official Quarantine

Maryland Department of Agriculture

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 26; 
Facility Type: Private Facility; 

Horse 1: 
Age: 15; Gender: Gelding; Breed: Thoroughbred (TB); Usage: Pleasure Riding; Onset of Clinical Signs: 1/30/2026; Confirmation Date: 2/6/2026; Horse Status: Quarantined; Vaccination Status: Status Unknown;
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