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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.


Date Disease Location Status
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. 

September 13, 2017 West Nile Virus Adams 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 has received confirmation of its 14th equine West Nile Virus case for 2017. The 15-year-old unvaccinated Arabian mare from Adams County was sampled on September 4th after exhibiting clinical signs for a few days. She was mildly ataxic and intermittently hypermetric with muscle tremors, particularly facial and appeared somewhat dazed, however, she was afebrile and eating.  The attending veterinarian stated that after anti-inflammatory treatment, she appears to have recovered completely.

September 12, 2017 West Nile Virus Jaffray, BC Confirmed Case(s): No Quarantine
Source: Private practitioner

A private practitioner has reported a confirmed case of WNV in a horse in Jaffrey, British Columbia. The 3-year-old Quarter Horse gelding started showing clinical signs on August 22nd which included twitching ears and muzzle, head tilt, deficits in proprioception, hypermetric gait, inability to turn in tight circles, over reactive to stimuli, and easy to pull over with tail in both directions. The horse was still alive when the case was reported.

September 12, 2017 Piroplasmosis Louisiana, United States Information Only
Source: Louisiana Department of Agriculture and Forestry

Equine Piroplasmosis Testing Reinstated at Louisiana Racetracks

Effective October 4, 2017, the Louisiana State Racing Commission (LSRC) has reinstated its rule, part B of the Louisiana Administrative Code (LAC) 35.I.1304, requiring all horses to have a negative Equine Piroplasmosis (EP) test, for Theileria equi, taken within the past 12 months, prior to entering the confines of a racetrack or race in Louisiana. This rule is not a requirement to enter the state of Louisiana but will be required for horses to enter a licensed racetrack or training facility. Questions about the EP ruling should be directed to the LSRC at (504) 483-4000. Questions about Louisiana entry requirements in general should be directed to the LA Department of Agriculture & Forestry, Veterinary Health Division at (225) 925-3980.

September 12, 2017 Strangles Pulaski County, VA Confirmed Case(s): No Quarantine
Source: Attending Veterinarian

The attending veterinarians reported an outbreak of Strangles in Pulaski County, Virginia. The Appaloosa cross gelding began showing clinical signs on August 22nd including nasal discharge, swelling of the lymph nodes, and fever. The gelding was initially isolated on the farm but has since been transported off the farm. The horse tested positive for Strangles on culture by nasal swab, lymph node aspirate, and serum. A Tennessee Walking Horse gelding and a Quarter Horse mare were also exposed as they were purchased from the same source and were hauled together prior to the onset of clinical signs. The TWH gelding and QH mare have been isolated.