Equine Disease Communication Center

Equine Disease Communication Center The Equine Disease Communication Center (EDCC) works to protect horses and the horse industry from the threat of infectious diseases in North America.

For more information on how the EDCC works, go to http://equinediseasecc.org The communication system is designed to seek and report real time information about disease outbreaks similar to how the Centers for Disease Control and Prevention (CDC) alerts the human population about diseases in people. The goal of the EDCC is to alert the horse industry about disease outbreak information to help miti

gate and prevent the spread of disease. Ultimately frequent and accurate information about diseases outbreaks improves horse welfare and helps to prevent negative economic impact that can result from decreased horse use due to a fear of spreading infection. As part of the National Equine Health Plan the EDCC will serve as part of the communication to help educate and promote research about endemic and foreign disease. Working in cooperation with state animal health officials and the United State Department of Agriculture, the EDCC seeks information about current disease outbreaks from news media, social media, official state reports and veterinary practitioners. Once information is confirmed, it is immediately posted on this website and messages sent to all states and horse organizations by email. Daily updates are posted until each outbreak is contained or deemed no longer a threat. To sign up for the EDCC Disease Outbeak Alert email list, go here: http://eepurl.com/b0dK9z

The EDCC is made possible by generous donations from organizations and horse owners. Please visit our sponsors that have generously supported this program for the benefit of the health and welfare of horses. To learn how you can help go to SUPPORT

August 31, 2026StranglesGrey County, ON. Alert ID: 5187Confirmed Case: Voluntary Quarantine Source: Ontario Ministry of ...
08/31/2026

August 31, 2026
Strangles
Grey County, ON.
Alert ID: 5187
Confirmed Case: Voluntary Quarantine
Source: Ontario Ministry of Agriculture, Food, and Agribusiness
Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Farm;

Horse 1:
Age: Suckling Foal; Gender: C**t; Breed: Standardbred; Onset of Clinical Signs: 8/24/2026; Clinical Signs: This 4 month old foal developed respiratory distress and was diagnosed with a retropharyngeal lymph node abscess, which was drained and the foal is recovering. Streptococcus equi was cultured from the abscess.; Horse Status: Recovering;

Comments: The owner, working with their veterinarian, has implemented voluntary animal movement restrictions and biosecurity protocols. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, go to https://equinediseasecc.org/strangles

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 31, 2026West Nile VirusMalheur County, OR. Alert ID: 5186Confirmed Case: No Quarantine Source: State Department o...
08/31/2026

August 31, 2026
West Nile Virus
Malheur County, OR.
Alert ID: 5186
Confirmed Case: No Quarantine
Source: State Department of Agriculture
Number Confirmed: 1;
Number Exposed: Unknown;
Number Euthanized: 1;
Comments: No WNV vaccination history;

For more information, go to

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 31, 2026West Nile VirusDistrict of Parry Sound, ON. Alert ID: 5185Confirmed Case: No Quarantine Number Confirmed:...
08/31/2026

August 31, 2026
West Nile Virus
District of Parry Sound, ON.
Alert ID: 5185
Confirmed Case: No Quarantine
Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Boarding Facility;
Horse 1:
Age: 5;
Gender: Mare;
Breed: Quarter Horse Cross;
Onset of Clinical Signs: 8/21/2026;
Clinical Signs: This mare developed neurologic signs (muscle fasciculations, mild ataxia) on August 21. She is recovering with treatment. Serum was positive for WNV IgM.;
Horse Status: Recovering; Vaccination Status: Unvaccinated;
Comments: This is the second confirmed case of equine WNV in Ontario this year . To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;;

For more information, go to https://equinediseasecc.org/west-nile-virus

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 31, 2026Eastern Equine Encephalitis and West Nile Virus Indian River, FL. Alert ID: 5184Confirmed Case: No Quaran...
08/31/2026

August 31, 2026
Eastern Equine Encephalitis and West Nile Virus
Indian River, FL.
Alert ID: 5184
Confirmed Case: No Quarantine
Source: Florida Department of Agriculture and Consumer Services and attending veterinarian
Number Confirmed: 1;
Horse 1:
Age: 16;
Gender: Gelding;
Breed: Quarter Horse;
Use: Pleasure Riding;
Onset of Clinical Signs: 8/19/2026;
Confirmation Date: 8/27/2026;
Clinical Signs: ataxia, extreme somnolence, nystagmus, stumbling; Horse Status: Euthanized;
Date Euthanized: 8/20/2026;
Vaccination Status: Undervaccinated.
Number Exposed: Unknown;
Number Euthanized: 1;
Facility Type: Private Facility;
Comments: This is the 6th confirmed case of EEE for Florida in 2026; Positive for both EEE and WNV.

For more information, go to

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 31, 2026StranglesHighlands County, FL. Alert ID: 5183Confirmed Case: Official Quarantine Source: Florida Departme...
08/31/2026

August 31, 2026
Strangles
Highlands County, FL.
Alert ID: 5183
Confirmed Case: Official Quarantine
Source: Florida Department of Agriculture and Consumer Services
Number Confirmed: 1;
Number Exposed: 8;
Facility Type: Private Facility;
Comments: This is the 21st confirmed case of strangles for Florida in 2026.;

For more information, go to

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 31, 2026StranglesLevy County, FL. Alert ID: 5182Confirmed Case: Official Quarantine Source: Florida Department of...
08/31/2026

August 31, 2026
Strangles
Levy County, FL.
Alert ID: 5182
Confirmed Case: Official Quarantine
Source: Florida Department of Agriculture and Consumer Services
Number Confirmed: 1;
Number Exposed: 2;
Facility Type: Private Facility;
Comments: This is the 22nd confirmed case of strangles for Florida in 2026.;

For more information, go to

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 31, 2026West Nile VirusSevier County, UT. Alert ID: 5181Confirmed Case: No Quarantine Source: Utah Department of ...
08/31/2026

August 31, 2026
West Nile Virus
Sevier County, UT.
Alert ID: 5181
Confirmed Case: No Quarantine
Source: Utah Department of Agriculture and Food
Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Comments: Recent history of in-state and out-of-state travel.;

For more information go to:

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 31, 2026West Nile VirusTooele County, UT. Alert ID: 5180Confirmed Case: No QuarantineSource: Utah Department of A...
08/31/2026

August 31, 2026
West Nile Virus
Tooele County, UT.
Alert ID: 5180
Confirmed Case: No Quarantine
Source: Utah Department of Agriculture
Number Confirmed: 1;
Number Exposed: Unknown;

For more information, go to

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 28, 2026West Nile VirusContra Costa County, CA. Alert ID: 5179Confirmed Case: No Quarantine Source: California De...
08/28/2026

August 28, 2026
West Nile Virus
Contra Costa County, CA.
Alert ID: 5179
Confirmed Case: No Quarantine
Source: California Department of Food and Agriculture
Number Confirmed: 1;
Horse 1:
Age: 2;
Gender: Mare;
Breed: Quarter Horse (QH);
Onset of Clinical Signs: 8/14/2026;
Clinical Signs: ataxia, muscle fasciculations, weakness, hypersensitivity;
Confirmation Date: 8/28/2026;
Horse Status: Affected And Alive;
Vaccination Status: Unvaccinated;
Comments: The eighth (8th) equine case of West Nile Virus in California in 2026 was confirmed in Contra Costa County. On August 28, 2026, a 2-year-old unvaccinated Quarter Horse mare in Contra Costa County displaying neurologic signs was confirmed positive for West Nile Virus. The mare is alive and recovering.;

For more information, go to

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 28, 2026Equine Infectious Anemia(Quarantine Release)Santa Clara County, CA. Alert ID: 5178Source: California Depa...
08/28/2026

August 28, 2026
Equine Infectious Anemia
(Quarantine Release)
Santa Clara County, CA.
Alert ID: 5178
Source: California Department of Food and Agriculture
Number Confirmed: 6;
Number Exposed: 50;
Number Euthanized: 6;
Comments: The fifty (50) potentially exposed horses on this premises tested negative on the sixty (60) day retest. Quarantine on this premises has been released.;
Previous Alerts: 5056

For more information, go to

Equine infectious anemia (EIA) is a potentially fatal blood-borne infectious viral disease that produces a persistent infection among equids nearly worldwide.

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