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Disease Outbreak 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.


September 15, 2017
Eastern Equine Encephalitis
Jackson County, WI
Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

The Wisconsin Department of Agriculture, Trade and Consumer Protection confirmed Eastern Equine Encephalitis in an unvaccinated 17-year old Quarter Horse mare. The horse was febrile, found down and non-responsive, and was euthanized on 8/27/17. This was the 12th EEE case in Wisconsin in 2017.

September 15, 2017
West Nile Virus
Owyhee County, ID
Confirmed Case(s): No Quarantine
Source: Idaho State Department of Agriculture

The Idaho State Department of Agriculture confirmed West Nile Virus in a 2-year old Appaloosa mare that had ataxia and muscle tremors. The horse is responding to medical treatment. For more information about WNV go to:  https://aaep.org/sites/default/files/Documents/Outside%20Linked%20Documents/DiseaseFactsheet_WNV.pdf

September 15, 2017
West Nile Virus
Jerome County, ID
Confirmed Case(s): No Quarantine
Source: Idaho State Department of Agriculture

The Idaho State Department of Agriculture confirmed West Nile Virus in a 5-year old Quarter Horse mare that had not been vaccinated for WNV.  Neurologic symptoms seen on 9/5/17 progressed from servere ataxia to seizures and an inability to stand. The horse was euthanized.  

September 14, 2017
Eastern Equine Encephalitis
Taylor County, WI
Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

The Wisconsin Department of Agriculture has confirmed Eastern Equine Encephalitis in Taylor County, Wisconsin in an unvaccinated 4.5-year old draft cross. The mare began showing neurologic signs of stumbling and blindness and had a fever on 9/4/17. The mare was euthanized on 9/5/17. This is Wisconsin's 13th confirmed case of EEE in 2017. 

September 14, 2017
West Nile Virus
Orleans County, NY
Confirmed Case(s): No Quarantine
Source: New York State Department of Agriculture

The New York State Department of Agriculture and Markets has confirmed two cases of equine West Nile virus. A 26-year-old mare in Tompkins County started developing clinical signs on September 8th including pronounced twitching and jerking movements in the forelegs, neck, and muzzle and reluctancy to move. A 5-year-old gelding in Orleans County started showing clinical signs on September 5th. The horse was off his feed and had a slight fever. Within 24 hours he exhibited stiffness in the front limbs, quivering of lips and twitching around the head. Neither horse had been recently vaccinated; both are recovering.

September 14, 2017
West Nile Virus
Ada County, ID
Confirmed Case(s): No Quarantine
Source: Idaho State Department of Agriculture

The Idaho State Department of Agriculture (ISDA) has confirmed a case of equine West Nile Virus in Ada County. The 2-year-old Arabian filly had been vaccinated as a yearling but no booster had been given. The horse presented with ataxia and difficulty standing; she underwent treatment and is recovering. This is Idaho’s third case of WNV in 2017.

September 14, 2017
West Nile Virus
Adair and Russell Counties, KY
Confirmed Case(s): No Quarantine
Source: Kentucky Department of Agriculture

The Kentucky Department of Agriculture confirmed 2 new cases of West Nile Virus. On 9-10-17 a 7-year old Tennessee Walking Horse gelding in Adair County was ataxic, able to rise and on 9-13-17 was alive and improving. On 8-31-17 a 13-year old Tennessee Walking Horse mare in Russell County had mild ataxia and on 9-13-17 was alive and continuing to improve. Neither horse had a history of vaccination.

September 13, 2017
Eastern Equine Encephalitis
Clare County, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

The Michigan Department of Agriculture and Rural Development received confirmation of an unvaccinated 10-year-old Morgan mare from Clare County that tested positive for Eastern Equine Encephalitis (EEE). The horse developed a sudden onset of neurologic disease, including head pressing, hyperexcitability, muscle fasciculations and ataxia in the hindlimbs. The horse was euthanized. No quarantines were issued. This bring the number of reported cases of EEE in Michigan for 2017 to three from Clare, Roscommon, and Wexford Counties.  

September 13, 2017
West Nile Virus
Colleton County, SC
Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian

The South Carolina State Veterinarian’s office confirmed the first positive WNV case in 2017. The 16-year old Paint gelding from Colleton County was not vaccinated and was euthanized. For more information go to  https://www.clemson.edu/public/lph/ahp/disease-info/index.html and https://aaep.org/sites/default/files/Documents/Outside%20Linked%20Documents/DiseaseFactsheet_WNV.pdf

September 13, 2017
West Nile Virus
Elko County, NV
Confirmed Case(s): No Quarantine
Source: Nevada Department of Agriculture

An 8-year-old QH gelding tested positive for WNV in Elko County.  The horse was euthanized due to clinical signs upon presentation and a serum sample for surveillance testing was obtained at that time.  The horse was not vaccinated; all other horses on the premise were vaccinated and no others are showing signs of disease to date.