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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 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.

September 22, 2017
West Nile Virus
Colleton County, SC
Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian

The South Carolina State Veterinarian confirmed two ponies in Colleton County tested positive for West Nile Virus (WNV).  An unvaccinated 22-year old Shetland gelding and a 13-year old Shetland gelding, that the owner thought was vaccinated but with an unknown date, were both euthanized.

September 22, 2017
Eastern Equine Encephalitis
Chesterfield, Horry, Aiken Counties, SC
Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian

The South Carolina State Veterinarian’s office has received laboratory confirmation of 3 additional Eastern Equine Encephalitis (EEE) positive cases for a total of 8 diagnosed in 2017. An 8-year old Appaloosa gelding from Chesterfield County, a 1.5-year old bay filly in Horry County and a 6-year old Haflinger mare in Aiken County had not been vaccinated and all were euthanized  

September 22, 2017
West Nile Virus
Hardin County, KY
Confirmed Case(s): No Quarantine
Source: Kentucky Department of Agriculture

The Kentucky Department of Agriculture has reported confirmation of a case of equine West Nile virus in Hardin County. The 17-year-old Quarter Horse gelding, which had no WNV vaccination history, presented with clinical signs on September 14th which included ataxia and muscle fasciculations. The horse received treatment and showed an initial response but relapsed and was euthanized on September 22nd after he became recumbent. This is the 11th equine WNV case confirmed in Kentucky in 2017.

September 22, 2017
West Nile Virus
Logan, Spanish Fork, Erda, Utah, Cache, Payson, Bluffdale, Honeyville, Salt Lake, and Box Elder Counties, UT
Confirmed Case(s): No Quarantine
Source: Utah Department of Agriculture and Food

The Utah Department of Agriculture has reported ten horses have tested positive for WNV with clinical signs initially observed between 9/8 and 9/20.  Horses are all from different premises located throughout the north-central part of the state. Five of the horses were treated and are recovering. The other five horses were not treated by their veterinarian and their status is unknown. The cases occurred in the following counties: Logan, Spanish Fork, Erda, Utah, Cache, Payson, Bluffdale, Honeyville, Salt Lake, and Box Elder Counties. For more information go to http://ag.utah.gov/animal/animal-health.html.

September 22, 2017
West Nile Virus
Brantley County, GA
Confirmed Case(s): No Quarantine
Source: Georgia Department of Agriculture

The Georgia Department of Agriculture has confirmed a case of WNV in Brantley County in a 2 year old, vaccinated QH. The horse presented with acute neurological signs and is recovering with supportive care. The 2017 total reported WNV cases in GA to date are 5 confirmed, 1 presumptive positive.

September 21, 2017
West Nile Virus
Johnson County, KY
Confirmed Case(s): No Quarantine
Source: Office of the Kentucky State Veterinarian

The Office of the Kentucky State Veterinarian has confirmed a case of equine West Nile virus in Johnson County. The 4-year-old Rocky Mountain Horse mare showed an onset of clinical signs on September 14th which included ataxia, muzzle twitch, and muscle fasciculations. The mare had no WNV vaccination history but was reported to be recovering on September 20th. This is Kentucky’s 10th confirmed equine WNV case in 2017.