Support the EDCC
Sign up for Email Alerts

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
October 02, 2017 West Nile Virus Garvin County, OK Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food and Forestry

The Oklahoma Department of Agriculture, Food and Foresty confirmed the second West Nile Virus positive horse for 2017 in Oklahoma. The 2-year old Quarter Horse gelding located in Garvin County was showing moderate neurologic signs.  Vaccination history is unknown.  A quarantine was not issued.  For more information visit: http://www.ag.ok.gov

September 29, 2017 West Nile Virus Pulaski County, KY Confirmed Case(s): No Quarantine
Source: Kentucky Department of Agriculture

The Kentucky Department of Agriculture confirmed West Nile Virus in a 2-year old male Tennessee Walking Horse presenting with ataxia and muscle fasiculations on 9-16-17. The horse which has no WNV vaccination history is responding to treatment with near full recovery. This is the 12th case of WNV in Kentucky in 2017.

September 28, 2017 Eastern Equine Encephalitis Taylor, Clark and Chippewa Counties, 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 3 cases of Eastern Equine Encephalitis. Horses included an unvaccinated Standardbred mare (age, clinical signs, and outcome unknown at this time) from Taylor County; a 3-year-old unvaccinated Quarter Horse stallion from Clark County found unable to rise and died shortly after he was sampled on 9/14/17; and a 5-year-old  Quarter Horse mare from Chippewa County found  lethargic in the morning of 9/17.  When examined by a veterinarian in the evening mare was  lethargic, reluctant to move, and ataxic.  The mare became recumbent during the night and was sampled and euthanized the next morning.  According to the attending veterinarian, this horse was vaccinated last year, but not this year. These are #15, 16, and 17 equine EEE cases in WI this year.

September 28, 2017 West Nile Virus Weber, Cache, Uintah, Beaver Counties, UT Confirmed Case(s): No Quarantine
Source: http://ag.utah.gov/animal/animal-health.html

The Utah Department of Agriculture and Food confirmed West Nile Virus in 4 horses between 9/21/17 to 9/25/17 in Weber, Cache and Uintah.  Horses included a 3-year old Quarter Horse gelding, a 6-year Quarter Horse mare, a Quarter Horse gelding and a 6-year old mare. Two horses were treated and are recovering and two horses were euthanized. A fifth horse presenting with  neurologic signs suggestive of WNV did not  have samples submitted and was euthanized due to the severity of clinical signs.

September 28, 2017 West Nile Virus Logan County, OK Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food and Foresty

The Oklahoma Department of Agriculture, Food and Foresty confirmed the first case of West Nile Virus for 2017 in a 12 year old Quarter Horse gelding in Logan County. The horse was showing severe neurologic signs and was euthanized. 

September 28, 2017 West Nile Virus Hillsdale 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, one-year-old Standardbred filly from Hillsdale County that tested positive for West Nile virus (WNV). The horse developed acute neurologic disease and was euthanized.  No quarantines were issued. This case brings the total number of reported cases of WNV in Michigan in 2017 to 14, one case from each of the following counties: Clinton, Hillsdale, Jackson, Livingston, Mecosta, Midland, Missaukee, Montcalm, Osceola, Ottawa, Roscommon, and St Joseph Counties and two cases from Wexford County.

September 27, 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 12-year-old Quarter Horse mare from Clare County that tested positive for Eastern Equine Encephalitis (EEE). The horse developed a sudden onset of fever, unwillingness to move, stumbling if moving, and lethargy.  The horse is being treated. No quarantines were issued. This bring the number of reported cases of EEE in Michigan for 2017 to four, two from Clare County, one from Roscommon County and one from Wexford County.  

September 25, 2017 West Nile Virus Clinton, Livingston, St. Lawrence, Erie, Genesee Counties, NY Confirmed Case(s): No Quarantine
Source: New York State Department of Agriculture and Markets

The New York State Department of Agriculture and Markets has confirmed five cases of Equine West Nile virus. An unvaccinated, 19-year-old mare in Clinton County showed an onset of clinical signs which included lethargy, unwillingness to move, muscle tremors and ataxia. The mare was treated for several days but was ultimately euthanized on September 20th. An unvaccinated 13-year-old mare in Livingston County was found in her stall with a swollen muzzle and signs consistent with being cast on September 14th. The mare was uncoordinated and reluctant to move upon examination but was still alive at the time of the report. A 2-year-old colt with no vaccination history in St Lawrence County presented with hind end weakness, was hyper-responsive to stimuli, and muscle tremors in the shoulders on September 12th. The outcome of the case is unknown. An unvaccinated, yearling filly in Erie County showed an onset of clinical signs on September 15th which progressed from off feed to a high fever and neurologic signs including twitching of the head, uncoordinated walk, and tail held off to the side. Despite treatment, the horse continued to decline, went down on September 21stwith seizures, and was euthanized the same day. A yearling filly in Genesee County with no vaccination history showed onset of clinical signs on September 15th which included leaning and unsteadiness. A veterinarian attended the filly on September 16th. The owners elected euthanasia.

September 23, 2017 West Nile Virus Boundary County, ID Confirmed Case(s): No Quarantine
Source: Idaho State Department of Agriculture

The Idaho Department of Agriculture has confirmed a case of equine West Nile virus in Boundary County. The 20-year-old Quarter Horse mare showed an onset of clinical signs on September 9th which included staggering, incoordination, hyperflexion when walking, and stumbling. The mare was unvaccinated but still alive at the time of the report.

September 22, 2017 Eastern Equine Encephalitis Atlantic County, NJ Confirmed Case(s): No Quarantine
Source: New Jersey Department of Agriculture

The New Jersey Department of Agriculture confirmed eastern equine encephalitis in a 9-year old mare in Atlantic County.  The illness started on 9/17/17 and the horse is reportedly being treated. The horse was vaccinated 2-years ago.