Equine Disease Communication Center

August 12, 2026
Pigeon Fever
Deschutes County, OR.
Alert ID: 5125
Confirmed Case: Official Quarantine
Source: State Department of Agriculture
Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: 16;

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Pigeon Fever | Equine Disease Communication Center Pigeon Fever caused by Corynebacterium pseudotuberculosis is a bacteria most often found in the Southwestern United States but reported throughout North America. Outbreaks in areas in which the bacteria had previously not been or only rarely reported have occurred during times of drought.

August 11, 2026
Eastern Equine Encephalitis
Jackson County, FL.
Alert ID: 5124
Confirmed Case: No Quarantine
Source: Florida Department of Agriculture and Consumer Services
Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Number Euthanized: 1;
Facility Type: Private Facility;
Comments: This is the 5th confirmed EEE case for Florida in 2026.;

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Eastern Equine Encephalitis | Equine Disease Communication Center Eastern Equine Encephalitis also known as the sleeping sickness, is a viral disease that causes inflammation of the brain and spinal cord. It is transmitted by mosquitoes.

August 11, 2026
Strangles
Miami-Dade County, FL.
Alert ID: 5123
Confirmed Case: Official Quarantine
Source: Florida Department of Agriculture and Consumer Services

Number Confirmed: 2;
Number Suspected: 4;
Number Exposed: 13;
Facility Type: Horse Rescue;
Comments: This is the 19th confirmed strangles case for Florida in 2026.;

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Strangles | Equine Disease Communication Center The upper respiratory disease commonly referred to as strangles is caused by Streptococcus equi subsp equi. Strangles is spread from horse to horse through direct contact. Horses can also contract the disease by coming into contact with contaminated surfaces. The disease is highly infectious.

August 11, 2026
Potomac Horse Fever
Knox County, TN.
Alert ID: 5122
Confirmed Case: No Quarantine
Source: Attending Veterinarian
Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Veterinary Hospital;

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Potomac Horse Fever | Equine Disease Communication Center Potomac Horse Fever (PHF) is a non-contagious infection caused by the rickettsial organism Neorickettsia risticii (previously known as Ehrlichia risticii). The disease can affect any age, breed or s*x of horse. PHF cases usually occur in summer and fall  but may occur in any season depending on wea...

August 11, 2026
Equine Influenza
Outagamie County, WI.
Alert ID: 5121
Confirmed Case: Voluntary Quarantine
Source: Wisconsin Department of Agriculture, Trade and Consumer Protection
Number Confirmed: 1;
Number Suspected: 2;
Number Exposed: Unknown;
Horse 1:
Age: 10;
Gender: Gelding;
Breed: Quarter Horse (QH);
Clinical Signs: Fever, nasal discharge, cough;
Confirmation Date: 8/3/2026;
Horse Status: Affected And Alive;
Vaccination Status: Vaccinated;

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Equine Influenza | Equine Disease Communication Center Equine Influenza is a highly contagious though rarely fatal respiratory disease. The virus is distinct from influenzas viruses in other species. The most common form of transmission is airborne droplets in  from affected horses. 

August 11, 2026
Eastern Equine Encephalitis
Hillsborough County, FL.
Alert ID: 5120
Confirmed Case: No Quarantine
Source: Florida Department of Agriculture and Consumer Services
Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;
Horse 1:
Age: 1;
Gender: Filly;
Breed: Paso Fino;
Onset of Clinical Signs: 7/21/2026;
Clinical Signs: incoordination;
Confirmation Date: 8/10/2026;
Horse Status: Affected And Alive;
Vaccination Status: Undervaccinated;
Comments: This is the 4th confirmed case of EEE for Florida in 2026.;

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Eastern Equine Encephalitis | Equine Disease Communication Center Eastern Equine Encephalitis also known as the sleeping sickness, is a viral disease that causes inflammation of the brain and spinal cord. It is transmitted by mosquitoes.

August 11, 2026
West Nile Virus
Benton County, WA.
Alert ID: 5119
Confirmed Case: No Quarantine
Source: WSDA and attending veterinarian
Number Confirmed: 1;
Facility Type: Private Facility;
Comments: 2 year old non-vaccinated gelding. Severely ataxic at time of blood draw. Horse died prior to receiving lab confirmation of WNV infection.;

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West Nile Virus | Equine Disease Communication Center West Nile virus (WNV) is a mosquito-borne flavivirus. WNV primarily causes disease in birds, humans, and horses and is transmitted by many different species of mosquitoes. Since 1999, more than 27,600 U.S. horses have been confirmed with WNV neuro-invasive disease with an estimated average case fata...

August 10, 2026
Vesicular Stomatitis
Montrose County, CO.
Alert ID: 5118
Confirmed Case: Official Quarantine
Source: USDA-APHIS-Veterinary Services
Comments: Since the last VSV situation report (7/24/2026), 2 new confirmed VSV-positive equine premises have been identified in Montrose County, Colorado. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype.
Updates are as follows: Colorado • Montrose County – 2 new confirmed positive equine premises • Since the last situation report (7/24/2026), 4 previously VSV-affected equine premises have been released from quarantine in Archuleta County (2), La Plata County (1), and Montezuma County (1).
New Mexico • Since the last situation report (7/24/2026), 2 previously VSV-affected equine premises have been released from quarantine in Rio Arriba and Valencia Counties.
Since the start of the outbreak, 39 VSV-affected premises have been identified (29 confirmed positive, 10 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 39 premises have had only equine species clinically affected with 15 premises located in 6 Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 8 premises located in 4 Colorado counties (Archuleta, La Plata, Montezuma, and Montrose Counties), and 16 premises located in 4 New Mexico counties (Rio Arriba, Sandoval, Santa Fe, and Valencia Counties).;
For more information, go tohttps://www.aphis.usda.gov/sites/default/files/vsv-sitrep-8-10-26.pdf

For more information, go to https://equinediseasecc.org/vesicular-stomatitis

Vesicular Stomatitis | Equine Disease Communication Center Vesicular stomatitis is a viral disease of horses, donkeys, mules, cattle, swine and New World camelids that occurs in the Western Hemisphere. The disease is named for the characteristic vesicular lesions it causes in the form of blisters, crusts and ulceration of the lips, muzzle, nose, tongue, ear...

August 10, 2026
West Nile Virus
Placer County, CA.
Alert ID: 5117
Confirmed Case: No Quarantine
Source: California Department of Food and Agriculture
Number Confirmed: 1;
Horse 1:
Age: 3;
Gender: Gelding;
Breed: Quarter Horse (QH);
Onset of Clinical Signs: 8/4/2026;
Clinical Signs: ataxia (all 4 limbs), hypersensitivity, mild muscle fasciculations, acting sedated;
Confirmation Date: 8/7/2026;
Horse Status: Affected And Alive;
Vaccination Status: Unvaccinated;

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West Nile Virus | Equine Disease Communication Center West Nile virus (WNV) is a mosquito-borne flavivirus. WNV primarily causes disease in birds, humans, and horses and is transmitted by many different species of mosquitoes. Since 1999, more than 27,600 U.S. horses have been confirmed with WNV neuro-invasive disease with an estimated average case fata...

August 10, 2026
Polk County, MN.
Alert ID: 5116
Confirmed Case: No Quarantine
Source: State Animal Health Official
Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Farm;
Horse 1:
Age: 3;
Gender: Gelding;
Breed: Standardbred;
Usage: Carriage;
Onset of Clinical Signs: 8/1/2026;
Clinical Signs: Weakness, ataxia;
Confirmation Date: 8/14/2026;
Horse Status: Recovering;
Vaccination Status: Unvaccinated;

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West Nile Virus | Equine Disease Communication Center West Nile virus (WNV) is a mosquito-borne flavivirus. WNV primarily causes disease in birds, humans, and horses and is transmitted by many different species of mosquitoes. Since 1999, more than 27,600 U.S. horses have been confirmed with WNV neuro-invasive disease with an estimated average case fata...