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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.


November 06, 2018
West Nile Virus
Warren County, TN
Confirmed Case(s): No Quarantine
Source: Office of the Tennessee State Veterinarian

The Office of the Tennessee State Veterinarian has reported a confirmed case of equine West Nile virus. An 8-year-old Tennessee Walking Horse mare in Warren County was confirmed positive on November 1st, 2018 by IgM ELISA. The vaccination status of the horse is unknown.

November 06, 2018
Equine Infectious Anemia
Weld County, CO
Confirmed case(s): Official Quarantine
Source: Colorado State Veterinarian’s Office

The Colorado Department of Agriculture’s, State Veterinarian’s Office, has been notified that a third Colorado horse has tested positive for Equine Infectious Anemia (EIA). The investigation is ongoing but appears to be unrelated to the prior two cases of EIA in Colorado this year. After initial test results were received, confirmatory testing was completed at the National Veterinary Services Laboratory (NVSL) in Ames, IA on November 2, 2018. The horse was tested at a veterinary clinic in Weld County as part of a pre-purchase examination under the buyer’s name. This horse allegedly participated in unsanctioned horse races. The investigation into the current location of the horse is ongoing.

November 06, 2018
Equine Infectious Anemia
Wyoming, United States
Quarantine Released
Source: Wyoming Livestock Board

The Wyoming Livestock Board, after completing the 60 day post exposure tests on 61 equine on 12 premises in 8 counties with all negative results has released all quarantines associated with Equine Infectious Anemia in the state.  These quarantines were the result of exposure of the equines to a Colorado horse which was later discovered to be positive for the disease.

November 05, 2018
West Nile Virus
Sullivan, Washington, Cumberland, Jefferson, Knox, Rutherford, McMinn, and Warren Counties, TN
Confirmed Case(s): No Quarantine
Source: Office of the Tennessee State Veterinarian

The Office of the Tennessee State Veterinarian has reported six confirmed cases of equine West Nile virus. A 10-year-old Quarter Horse gelding in Sullivan County was confirmed positive on September 27th, 2018 by IgG/IgM ELISA. A 14-year-old Quarter Horse gelding in Washington County was confirmed positive on October 19th by IgG/IgM ELISA. A Tennessee Walking Horse gelding in Washington County was confirmed positive on October 23rd by IgG/IgM ELISA. A 4-year-old Thoroughbred mare in Cumberland County was confirmed positive on October 27th by IgG/IgM ELISA. A horse in Jefferson County was confirmed positive on October 25th by IgM ELISA. A horse in Knox County was confirmed positive on October 26th by IgM ELISA. A 9-year-old Tennessee Walking Horse mare in Rutherford County was confirmed positive on October 25th on PCR. A 7-year-old mixed breed gelding in McMinn County was confirmed positive on October 24th by IgM ELISA. A 3-year-old pony mare in Warren County was confirmed positive on August 31st by IgM ELISA. The vaccination status of all of the horses is unknown.

November 04, 2018
West Nile Virus
Aiken County, SC
Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian's Office

 The South Carolina State Veterinarian’s office has received laboratory confirmation for the fourth case of West Nile Virus in SC in 2018 in Aiken County. It is the first case for Aiken County this year. The case was a 6 year old Thoroughbred gelding that had been vaccinated approximately 10 months ago. The horse is currently quarantined and recovering.

November 02, 2018
Equine Infectious Anemia
Lamar County, GA
Outbreak Update
Source: Georgia Department of Agriculture

The Georgia Department of Agriculture has updated information on the cases of Equine Infectious Anemia (EIA) discovered in Lamar County, August 2018. The Department has released the quarantine on one premise after follow up testing revealed no additional cases. A second premise remains under quarantine pending results from follow up testing.

November 02, 2018
West Nile Virus
Brooks, Franklin, and Hart Counties, GA
Confirmed Case(s): No Quarantine
Source: Georgia Department of Agriculture

The Georgia Department of Agriculture has confirmed WNV cases in the following counties: Brooks, Franklin, and Hart. The 2018 total reported WNV cases in GA to date are 3 confirmed.

November 01, 2018
West Nile Virus
Clarke County, VA
Confirmed Case(s): No Quarantine
Source: Virginia Department of Agriculture and Consumer Services

The Virginia Department of Agriculture and Consumer Services (VDACS) has confirmed a case of equine West Nile virus in Clarke County. A vaccinated, 8-year-old Holsteiner stallion developed mild ataxia, prominent skin twitching and moderate behavioral anxiety on 10/13/18. Serum from the horse was positive on the IgM Capture ELISA performed at the Animal Health Diagnostic Center at Cornell University. The affected horse has fully recovered.

October 31, 2018
West Nile Virus
Logan County, OK
Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food, and Forestry

The Oklahoma Department of Agriculture, Food, and Forestry has confirmed a case of equine West Nile virus in Logan County. An unvaccinated 2-year-old Quarter horse filly was showing severe neurologic signs but it improving with treatment. A quarantine was not issued. For more information visit http://www.ag.ok.gov

October 31, 2018
West Nile Virus
Bryan, Garvin, Payne, Osage, Grady Counties, OK
Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food, and Forestry

The Oklahoma Department of Agriculture, Food, and Forestry has reported five confirmed cases of equine West Nile virus. A three-year-old quarter horse filly located in Bryan County was showing severe neurologic signs and was euthanized. The vaccination history is unknown. A yearling Quarter Horse stallion located in Garvin County was showing moderate neurologic signs and was unvaccinated. A 12-year-old Warmblood gelding located in Payne County was showing severe neurologic signs and was euthanized. The horse was current on vaccinations. A 2-year-old Quarter Horse gelding located in Osage County was showing severe neurologic signs and died within 24 hours. The vaccination history is unknown. A 3-year-old Clydesdale/Hackney female located in Grady County was showing mild neurologic signs. The horse was currently vaccinated for WNV. No quarantines were issued. This brings the number of confirmed cases of equine West Nile virus in OK in 2018 to 10.