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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.


October 01, 2018
West Nile Virus
Stephens County, OK
Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food, and Forestry

The Oklahoma Department of Agriculture, Food, and Forestry has reported the fourth equine West Nile virus case  for 2018 in Oklahoma. The 1 year old QH female located in Stephens County was showing severe neurologic signs and was not vaccinated.  A quarantine was not issued.  For more information visit:http://www.ag.ok.go

September 28, 2018
West Nile Virus
Bingham County, ID
Confirmed Case(s): No Quarantine
Source: Idaho Department of Agriculture

The Idaho Department of Agriculture confirmed West Nile Virus (WNV) in Bingham County. in On September 25, 2018 an an 11-year old Quarter Horse mare had neurologic signs including nose twitching, agitation, depression and hind limb weakness. The vaccination status is unknown, and there is no quarantine. This is Idaho’s 5thWNV case in 2018.

September 28, 2018
Equine Infectious Anemia
Weld County, CO
Confirmed case(s): Official Quarantine
Source: Colorado Department of Agriculture

On September 28, 2018 the Colorado Department of Agriculture confirmed a second case of Equine Infectious Anemia (EIA) in Weld County. The 7-year old Quarter Horse mare had weight loss and anemia. Seventeen horses including the affected horse on the private facility are under quarantine. The horses under quarantine will be observed, tested and then retested in 60 days. This case is unrelated to the previous confirmed case in Weld County. For more information go to: https://www.colorado.gov/pacific/agmain/news/9282018-second-eia-positive-horse-identified-colorado

September 28, 2018
West Nile Virus
Chautauqa, Genesee, Orleans 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 confirms New York's 10th, 11th, 12th West Nile Virus (WNV) cases.

On September 18, 2018 a 17-year old mare from Mayville, NY (Chautauqua Co) was unsteady on her feet which progressed over a few days’ time. The mare was unvaccinated and was euthanized on September 20th. On September 19th a 25-year old, unvaccinated gelding from Leroy NY (Genesee County) had a high fever. The next day, ataxia, tremors and inappetance developed. Veterinary treatment was initiated and this horse is alive as of September 28th.  On September 21st an unvaccinated 16-year old gelding from Albion, NY (Orleans Co) had behavior changes, incoordination and inappetance. The veterinarian  initiated treatment and as of September 28th this gelding is recovering quite well. In all three cases, blood tests confirmed active WNV infection.

September 28, 2018
West Nile Virus
Langenburg, Corman Park, Briannia, Arlington, Maple Creek Municipalities, SK
Confirmed Case(s): No Quarantine
Source: Canadian Animal Health Surveillance System

The Canadian Animal Health Surveillance System has reported 6 cases of equine West Nile Virus (WNV) in Saskatchewan. A yearling Quarter Horse gelding in the Regional Municipality of Langenburg was examined on August 21st, 2018. The horse had been vaccinated with Eastern/Western/Tetanus and WNV two weeks prior to onset. The horse was treated with Banamine and IV fluids and is recovering.  A 6-year-old Thoroughbred mare in the Regional Municipality with no vaccination history was examined on September 9th and was euthanized. A 5-year-old Quarter Horse cross mare in the Regional Municipality of Corman Park that hadn’t been vaccinated for two years was examined on September 7th and treated with Dexamethasone. The outcome was unspecified. A 9-year-old Quarter Horse mare with no vaccination history in the Regional Municipality of Britannia was examine on September 9th and treated with IV fluids and DMSO. The horse is recovering. A 2-year-old Quarter Horse gelding with no vaccination history in the Regional Municipality of Arlington was examined on September 15th and treated with Dexamethasone and DMSO is recovering. A 7-year-old Quarter Horse mare with no vaccination history in the Regional Municipality of Maple Creek was examined on September 18th and treated with Non-steroidal anti-inflammatories is recovering. For more information go to: https://www.cahss.ca/surveillance/equine/

September 28, 2018
West Nile Virus
Tuscarawas, Wayne, Holmes Counties, OH
Confirmed Case(s): No Quarantine
Source: Ohio Department of Agriculture

The Ohio State Department of Agriculture confirmed 7 new cases of West Nile Virus (WNV) in September 2018. On September 18th12-year-old Standardbred gelding from Tuscarawas County had weak posterior limbs. The veterinarian described the symptoms as mild. The horse was not vaccinated against WNV. The horse is alive and recovering as of September 25th. On September 18tha 7-year-old Pony mare from Tuscarawas County wouldn’t move and had weak front limbs. Facial paralysis, a low-grade fever, malaise, lack of appetite, and mild ataxia were found during the veterinarian’s examination. The horse was not vaccinated against WNV. The horse is alive and recovering as of September 25th. On September 18tha 3-year-old Standardbred gelding from Wayne County was uncoordinated and had a low-grade fever. The horse was not vaccinated against WNV. The horse is alive and recovering as of September 26th. On September 19tha 7-year-old Standardbred gelding from Tuscarawas County was lame, stiff and had weak hind limbs. The unvaccinated horse is alive and responding to veterinary treatment recovering as of September 26th.On September 19than adult Belgian mare from Holmes County was off balance and had weak rear legs. On September 20th the horse was down and unable to rise. In spite of treatment, the owner opted to euthanize the horse on September 20th. The horse was not vaccinated against WNV. On September 19than adult Standardbred gelding from Wayne County had an unsteady gait. The horse was treated by a veterinarian, is alive and is recovering as of September 26th. The thirty-eighth positive horse was a 2-year-old Morgan mare from Holmes County. The horse was not vaccinated against WNV.  As of September 28ththe clinical outcome is not known. Serum samples collected and submitted to NVSL (seven cases) and Cornell University (one case), were all reported positive for WNV exposure by IgM capture ELISA titer of 1:400. As of September 27, Ohio has had 38 confirmed cases of WNV.

September 28, 2018
West Nile Virus
Muskegon County, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

The Michigan Department of Agriculture and Rural Development confirmed a second case of West Nile virus (WNV) for 2018. An unvaccinated 15-year-old Standardbred mare from Muskegon County, began to experience severe incoordination in the hindlimb on September 13, 2018. The horse was euthanized. No quarantines were issued.

September 27, 2018
Equine Infectious Anemia
Multiple Counties, CO
Information Only
Source: Colorado Department of Agriculture

The Colorado State Veterinarian’s Office at CDA has continued to work to trace and test horses involved in the EIA Incident in the State of Colorado. As of 09/27/2018: ·There is only one confirmed positive horse in Colorado (index case); ·The index premises in Weld County is under a quarantine order; two associated premises are under hold orders. The 124 exposed horses under quarantine on the index premises tested negative for EIA on 09/10/2018. They will be re-tested on or after 10/19/2018 (sixty days after last exposure to the positive horse). 138 exposed horses have been located in Colorado (out of approximately 152 we expect to be in the state). ·61 premises are under hold orders in 24 Colorado counties: Adams, Arapahoe, Archuleta, Boulder, Costilla, Crowley, Delta, Douglas, Eagle, Elbert, El Paso, Fremont, Gilpin, Gunnison, Huerfano, Jefferson, Larimer, Mesa, Moffat, Montrose, Morgan, Phillips, Sedgwick, and Weld. ·Five premises have been released from hold after the 60-day re-tests were completed for all exposed horse(s) on those premises and found to be negative. ·72 exposed horses have been positively identified in 12 other states (out of approximately 83 we expect to be out-of-state): Arizona, Idaho, Kentucky, Louisiana, Maine, Missouri, Nebraska, Nevada, Oklahoma, Tennessee, Texas, and Wyoming. Re-testing of Exposed Horses under Hold Orders: Many of the exposed horses will be eligible for their final 60-day EIA re-test over the next three weeks. We have informed owners of exposed horses to work with their veterinarians to get the re-testing done after the date stated on their Hold Orders. The date varies depending on the last date that their horse was exposed to the EIA-positive horse. At this time only the exposed horses need to be tested, not all of the horses on the premises under the Hold Order. Once we receive the negative 60-day EIA re-test results, CDA will release the Hold Order as quickly as possible so please notify our office with the results. If you have any questions, please call the State Veterinarian’s Office at 303-869-9130 or email animalhealth@state.co.us.

September 27, 2018
West Nile Virus
Woodford County, KY
Confirmed Case(s): No Quarantine
Source: Kentucky Department of Agriculture

On Thursday, September 27, 2018, the Kentucky Office of the State Veterinarian confirmed a case of West Nile Virus (WNV) in Woodford County. The 5 year-old mare began showing clinical signs on September 18, 2018 including muscle fasciculation, hypermetria, profuse sweating throughout body, hyperexcitability, and progressive ataxia in all 4 limbs. The mare was euthanized. Vaccination was reported as being current with annual vaccination, the most recent one being in January 2018. For more information about West Nile go to: https://aaep.org/sites/default/files/Documents/Outside%20Linked%20Documents/DiseaseFactsheet_WNV.pdf

September 27, 2018
West Nile Virus
Woodward County, OK
Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food and Forestry

The Oklahoma Department of Agriculture, Food and Forestry confirmed the third West Nile Virus (WNV) case  positive horse in Oklahoma for 2018. An unvaccinated 2-year old Quarter Horse stallion located in Woodward County had moderate neurologic signs.  A quarantine was not issued.  For more information visit:http://www.ag.ok.gov