Outbreaks | Equine Disease Communication Center

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.

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West Nile Virus

Boyle, Harrison, Jackson, and Mercer Counties, KY

Alert ID: 1050

September 20, 2018

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.

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