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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 22, 2018
West Nile Virus
Trumbull, Wayne, Holmes, Tuscarawas, Coshocton, Ashtabula Counties, OH
Confirmed Case(s): No Quarantine
Source: Ohio Department of Agriculture

The Ohio Department of Agriculture has reported 14 additional cases of equine West Nile virus (WNV), bringing the total number of confirmed cases in 2018 to 31. A 2-year-old Hackney Pony gelding from Trumbull County began showing symptoms on September 5th 2018 including hypersensitivity, ataxia, and a fever. horse was not vaccinated against WNV. As of 09/06/2018 the horse was alive and recovering. A 13-year-old Standardbred gelding from Wayne County started showing clinical signs on 09/04/2018. owner began noticing an uncoordinated gait, ataxia and a droopy lip. horse was not vaccinated against WNV /2018 the horse was alive and recovering. A 3-year-old Standardbred mare from Holmes County started showing clinical signs on 09/04/2018 when the owner began noticing an uncoordinated gait, severe ataxia and a droopy lip. horse was not vaccinated against WNV. As of 09/18/2018 the horse was alive and slowly recovering. A 5-year-old Standardbred gelding from Tuscarawas County showed an onset of clinical sign son 9/10/2018 when the owner began noticing posterior paresis and ataxia. The horse was not vaccinated against WNV. As of 09/19/2018 the horse was alive and recovering. A 3-year-old Dutch Harness gelding from Tuscarawas County showed anorexia and posterior paresis. The horse was not vaccinated against WNV. As of 09/10/2018 the horse was alive and recovering. An 8-year-old Percheron mare from Holmes County showed an onset of clinical signs on 09/07/2018 including severe ataxia, severe muscle fasciculations and bilateral hind limb paresis. The horse was not vaccinated against WNV and was euthanized. A 3-year-old Belgian gelding from Coshocton County. Started showing ataxia on 09/08/2018. Symptoms progressed to muscle tremors, incoordination and proprioceptive deficits in all legs. The horse was not vaccinated against WNV. The horse was recovering as of 09/17/2018. A horse from Ashtabula County showed an onset of clinical signs on 09/03/2018 The owner first noticed that the horse had trouble standing. The veterinarian examined the horse and noticed it was ataxic, had proprioceptive deficits in all legs, facial muscle fasciculations, a heart rate of 36 and a fever of 101.6°. The horse was not vaccinated against WNV. The horse was recovering as of 09/17/2018. A 10-year-old Standardbred mare from Wayne County started showing symptoms on 09/11/2018 and was brought to the clinic because it was laterally recumbent, unable to rise, had minimal movement in the fore limbs, and progressed to a loss of function in the rear limbs. The horse was not vaccinated against WNV. The horse was euthanized on 09/15/2018. A 10-year-old Paint gelding from Tuscarawas County. The horse was ataxic all over, it was down but rose when the Veterinarian went to check on it. The horse was not vaccinated against WNV. The horse was euthanized. An adult Belgian gelding from Holmes County started showing signs on 09/08/2018. The veterinarian received a call for a horse walking in circles. Upon arrival the horse was unable to rise and would continuously fall. It had posterior paresis and was down later that day. The horse was not vaccinated against WNV. The horse is alive and recovering as of 09/19/2018. A 4-year-old Morgan gelding from Holmes County started showing clinical signs on 09/09/2018. The Veterinarian was called out for a wobbly horse, upon arrival they noticed that the horse was down. The horse was not vaccinated against WNV. The horse was euthanized. A 6-year-old Standardbred gelding from Wayne County started showing clinical signs on 09/04/2018 when the owner first noticed the horse had a droopy lip. Two days later the symptoms progressed to full body tremors and localized muscle fasciculations, front limb paresis, and was laterally recumbent. The horse was not vaccinated against WNV. The horse is alive and recovering as of 09/14/2018. A 7-year-old Mule Mollie from Tuscarawas County started showing clinical signs on 9/1/2018. The owner was trying to load the mule onto a trailer, the mule got off the trailer and was agitated and hypersensitive. The mule began running down the road, collapsed and died suddenly. The horse was not vaccinated against WNV. The horse is deceased. Serum samples from all horses were positive for WNV using IgM capture ELISA with titers of 1:400 or greater.

September 22, 2018
Equine Herpes Viruses
Montgomery County, MD
Confirmed case(s): Official Quarantine
Source: Maryland Department of Agriculture
  1. September 21, 2018, the Maryland Department of Agriculture, Animal Health Program confirmed a positive Equine Herpesvirus Myeloencephalopathy (EHM) in a 12-year old warmblood gelding in a Maryland horse. The neurological horse was seen earlier and treated as an outpatient on September 21st at a private veterinary clinic Loudoun County, Virginia before returning home to a private farm in Montgomery County, Maryland. A hold order placed on the farm the evening of September 21st. There are 18 horses on the farm in three barns. The positive gelding is isolated from all horses on the farm. The positive gelding was previously housed with 4 horses in one barn. The other two barns are more than 30 feet away from the exposed barn. Strict isolation and biosecurity protocols are in place at the exposed barn with body temperatures taken twice daily. With all three barns there will be no movement on or off the farm. The other two barns will be observed daily and adhering to strict biosecurity procedures. The attending veterinarians that administers to this farm will be notified of the hold order and apprised of the procedures taken to control the spread of EHV-1/EHM. Possible links to the positive gelding are actively being investigated.

 

September 21, 2018
Equine Infectious Anemia
Colorado, United States
Information Only
Source: Colorado State Veterinarian’s office

The Colorado State Veterinarian’s office has reported the following information: as of September 20th, 2018, the Equine Infectious Anemia (EIA) Incident in Colorado has resulted in only one confirmed positive EIA horse in Colorado which is the index case. The index premises in Weld County is under a quarantine order; two associated premises are under hold orders. Fifty-one (51) premises are under hold orders in 20 Colorado counties: Adams, Arapahoe, Boulder, Crowley, Delta, Douglas, Eagle, Elbert, El Paso, Fremont, Gilpin, Gunnison, Huerfano, Jefferson, Larimer, Mesa, Moffat, Montrose, Phillips, and Weld Counties. The counties are not under Hold Orders, only the premises within the counties are under the Hold Orders until re-testing is complete. 122 exposed horses that left the index premises have been located in Colorado and are under Hold Orders. 124 exposed horses under quarantine on the index premises tested negative for EIA last week; they will be re-tested on or after 10/19/2018 (sixty days after last exposure to the positive horse). Fifty-seven (57) exposed horses that left the State have been positively identified in nine other states: Arizona, Kentucky, Louisiana, Maine, Nebraska, Nevada, Oklahoma, Texas, and Wyoming. Some of the exposed horses will be eligible for their final 60-day EIA re-test in the next week – CDA is working with those individual horse owners and their veterinarians so that the Hold Orders can be released on a final negative test.

 

September 21, 2018
West Nile Virus
Navajo and Coconino Counties, AZ
Confirmed Case(s): No Quarantine
Source: Arizona State Veterinarian’s office

The Arizona State Veterinarian’s office has received notification of two confirmed cases of West Nile virus (WNV) in horses over the last week. One horse is in Navajo county and the other is in N. Coconino county. Both horses are reportedly responding well to treatment. All of the confirmed cases were in unvaccinated horses or horses with an unknown vaccination history.

September 21, 2018
West Nile Virus
Washington, Orleans, Ontario, Lewis, and Erie 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 confirmed 5 more cases of West Nile Virus. No cases or premises are quarantined at this time. A 4-year gelding from Ft. Edward (Washington County) was euthanized on September 6, 2018 after falling on September 3rd. A 9-year old gelding from Lyndonville (Orleans County) is recovering, a 10-year old mare from Canandaigua (Ontario County), a 5-year mare from Lowville (Lewis County) is recovering and a 18-year old gelding from Eden (Erie County) is recovering. All are under veterinary oversight.

September 20, 2018
West Nile Virus
Boyle, Harrison, Jackson, and Mercer Counties, KY
Confirmed Case(s): No Quarantine
Source: Office of the Kentucky State Veterinarian

The Office of the Kentucky State Veterinarian has reported four confirmed cases of equine West Nile virus. A 15-year-old Tennessee Walking Horse mare with no WNV vaccination history in Boyle County showed an onset of clinical signs on September 18th, 2018 including ataxia. The horse progressively worsened and was euthanized on September 20th. A 5-year-old pleasure mare with no WNV vaccination history in Harrison County showed an onset of clinical signs on September 15th including lethargy, muscle fasciculation in the lower jaw and chest areas, and rear limb ataxia. The horse was euthanized. An 18- month-old Standardbred filly with no WNV vaccination history in Jackson County showed an onset of clinical signs on September 10th. The horse was described as in serious condition with rear limb ataxia and was crossing over with the front feet. The horse was advised to be rechecked on September 20th. A 12-year-old American Saddlebred mare in Mercer County showed an onset of clinical signs on September 13th including ataxia, muscle fasciculation, and a low-grade fever. The horse was euthanized on September 19th and had no WNV vaccination history. Testing for all four cases was completed and reported by the University of Kentucky Veterinary Diagnostic Lab; cases were confirmed based on detectable WNv IgM antibodies.

September 20, 2018
West Nile Virus
Lyon, Seward, Neosho, Marion and Wichita counties, KS
Confirmed Case(s): Voluntary Quarantine
Source: Kansas Department of Agriculture Division of Animal Health

The Kansas Department of Agriculture Division of Animal Health has received notification of multiple confirmed cases of West Nile virus (WNV) in horses across the state over the past few weeks. Confirmed cases have been reported in Lyon, Seward, Neosho, Marion and Wichita counties. All of the confirmed cases were in unvaccinated horses or horses with an unknown vaccination history. For more information go to http://agriculture.ks.gov/AllNewsItems/2018/09/20/west-nile-virus-confirmed-in-horses-in-kansas

September 20, 2018
West Nile Virus
Anderson County, SC
Confirmed Case(s): Voluntary Quarantine
Source: South Carolina State Veterinarian’s office

The South Carolina State Veterinarian’s office has received laboratory confirmation for the second case of West Nile Virus in SC in 2018 in Anderson County. The case was a 20 yr. old mustang gelding that had no vaccination history and recovered. There is one other equid on the premises, and vaccination and quarantine has been self-imposed by the owner.

September 19, 2018
Equine Infectious Anemia
Dallas County, TX
Confirmed case(s): Official Quarantine
Source: Texas Animal Health Commission

On June 13, 2018, Texas Animal Health Commission (TAHC) officials reported Equine Infectious Anemia (EIA) in one Dallas County Quarter Horse. Since that time, one additional horse from the quarantined premises has been confirmed positive for EIA. In addition, TAHC officials have confirmed EIA in another unrelated Dallas County Quarter Horse. The positive horses have been euthanized. The premises in Dallas county will remain under quarantine until requirements for release have been met. TAHC staff is working closely with owners and veterinarians to monitor potentially exposed horses and implement biosecurity measures.

September 18, 2018
Strangles
Ostego and Livingston Counties, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

The Michigan Department of Agriculture and Rural Development  confirmed two new cases of Strangles. On September 2, 2018 a 15-year-old, unvaccinated Quarter Horse gelding from Otsego County was found with nasal discharge from one  nostril. The other case was a two-year-old, unvaccinated Quarter Horse mare from Livingston County. The mare developed nasal discharge and enlarged glands that ruptured and abscessed on September 10th. Both horses are under the care of a veterinarian and no quarantines were issued with either case. These two cases bring the total number of confirmed 2018 strangles cases in Michigan to 17.