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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
October 30, 2017 West Nile Virus Clark 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 confirmed a case of Equine West Nile Virus in a 7-year-old unvaccinated Quarter Horse mare from Clark County.  She showed minor neurologic signs on 10/21/17 (lip droop, slight incoordination). She went down on 10/22/17 but got back up.  On 10/23/17, she went down again and a local veterinarian was called.  He sampled and treated her, but she died a couple of days later.  NVSL performed the laboratory diagnostic tests. This is the 22nd case of equine WNV reported in Wisconsin in 2017.

October 27, 2017 West Nile Virus Licking, Columbiana, Ashland, Counties, OH Confirmed Case(s): No Quarantine
Source: Ohio Department of Agriculture

The Ohio Department of Agriculture confirmed West Nile Virus in the 12th 13th and 14th  Ohio horses. The 12th horse was from Utica, Ohio in Licking County, and was first seen sick on 10/6/17, with limited clinical data available as of 10/27/17. The 13th horse was from Negley, Ohio in Columbiana County (second confirmed case), a 5-year old Percheron gelding that presented on 10/15/17 with acute onset of ataxia, weakness in the rear limbs and a temperature of 101 F. Outcome and vaccine status is pending. The 14th horse was from Loudonville, Ohio in Ashland County, a 6-month old Haflinger colt who had an onset of illness on 10/18/17 with clinical signs including ataxia of all 4 limbs, slight depression and fell over when led. The next day it was in flat recumbency and the owner elected euthanasia. The horse was not vaccinated against WNV.

October 27, 2017 West Nile Virus Charles, Horry, Orangeburg Counties, SC Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian's Office

The South Carolina Veterinary Office confirmed three horses with West Nile Virus one each in Charleston, Horry and Orangeburg Counties. One horse was euthanized and the other two are still alive. The 6-year old mare in Horry county was reported to be improving. WNV has been diagnosed in 5 counties: Charleston- 1 horse; Cherokee- 1 horse; Colleton- 3 horses; Horry- 1 horse; Orangeburg- 1 horse.

October 27, 2017 Equine Infectious Anemia Gallatin County, MT Confirmed case(s): Quarantine
Source: Montana Department of Livestock

The Montana Department of Livestock has reported multiple horses on a premises in Gallatin County have tested positive for Equine Infectious Anemia. The preliminary tests were confirmed by the USDA-APHIS National Veterinary Service Laboratories. The premises is under quarantine and additional follow-up testing is underway for the other equines on the facility.

October 27, 2017 West Nile Virus Euclid, MN Confirmed Case(s): No Quarantine
Source: Minnesota Board of Animal Health

West Nile Virus has been diagnosed in a 33 year old American Quarter Horse mare in Euclid, Minnesota. The attending veterinarian reported that on October 9 the horse presented with incoordination and exhibited weakness in both hind legs. The horse responded to supportive care to control pain and inflammation and showed significant improvement in clinical signs within a week. Laboratory results confirmed West Nile Virus on October 23. The horse’s vaccine history is unknown prior to 2015 when the reporting veterinarian began vaccinating the mare annually, with the most recent vaccine being administered this spring. For more information go to

October 26, 2017 Equine Infectious Anemia Finney County, KS Outbreak Update
Source: Kansas Department of Agriculture

All horses on a premises under official quarantine by the Kansas Department of Agriculture for EIA in Finney County were retested for 60-day retesting protocol. Two horses, which were previously EIA-negative, tested positive at this retest. Both of the confirmed EIA-positive horses have been humanely euthanized. Both horses had been maintained on the premises under the official quarantine since August 11, 2017 pending the 60-day retest.All other horses from this premises will remain under official quarantine for an additional 60 days pending a negative EIA test. For more info go to:

October 26, 2017 Strangles Crawford and Lowndes Counties, GA Confirmed case(s): Quarantine
Source: Attending Veterinarian

Strangles has been reported at two facilities in Georgia by an attending veterinarian. One facility, located in Crawford County, has reported 3 horses (10 exposed) affected with nasal discharge, coughing and swollen legs. The second facility, located in Lowndes County, has reported one horse (16 exposed) affected with nasal discharge, fever, off feed and lethargy. Both facilities are under quarantine. For more info go to:

October 26, 2017 Eastern Equine Encephalitis Cape May County, NJ Confirmed Case(s): No Quarantine
Source: New Jersey Department of Agriculture

On October 24, 2017, the New Jersey Department of Agriculture confirmed two horses were positive for Eastern Equine Encephalitis (EEE) and both were euthanized as a result of the infection. The 10 and 11-year-old unvaccinated geldings were both located in Cape May County. Thus far, all horses were positive for EEE or WNV have been located in the southern counties: Atlantic County: 1 EEE+; Cape May County: 2 EEE+; Cumberland County: 2 EEE+; Gloucester County: 1 WNV+ and Salem County: 1 WNV+. In all cases, the positive horses were either not vaccinated, were not current on vaccination, had an unknown vaccination history, or did not receive the necessary booster following the initial vaccination.  

October 25, 2017 West Nile Virus Garvin and McClain Counties, OK Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food and Forestry

The Oklahoma Department of Agriculture has confirmed two cases of equine West Nile Virus. A 2 year old QH colt located in Garvin County showed mild neurologic signs and recovered completely.  The horse was not vaccinated. A 3 year old Friesian stallion located in McClain County was showing severe neurologic signs and was euthanized.  Vaccination history is unknown. This brings the number of reported equine WNV cases to 5 in Oklahoma in 2017. For more information visit:

October 25, 2017 Equine Infectious Anemia Sturgeon County, AB Investigation Initiated
Source: Canadian Food Inspection Agency

On October 13, 2017 a positive Equine Infectious Anemia (EIA) result was confirmed by the Canadian Food Inspection Agency’s (CFIA) national reference laboratory for a horse that had been sampled by an accredited veterinarian on a premise in Sturgeon County, Alberta (AB). The horse was exhibiting clinical signs that were compatible with EIA and it died shortly after being sampled. A CFIA investigation is currently underway and it has been reported that there are several other equine animals on the index premises. Work is being done to identify other potential contacts as per current policy.