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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
August 03, 2016 Eastern Equine Encephalitis Madison, TN Confirmed Case(s): No Quarantine
A horse in Madison County, Tennessee has tested positive for Eastern Equine Encephalitis (EEE), a virus that can be fatal for horses and humans. The horse did not survive. The Tennessee departments of Agriculture and Health are advising citizens to take precautions to protect themselves and their livestock. - See more at:
August 03, 2016 West Nile Virus Sibley County, MN Confirmed Case(s): No Quarantine
An unvaccinated horse in Sibley County, Minnesota has tested positive for West Nile Virus and is severely ill. The 1.5-year-old Friesian stallion has been unable to stand for a week and is receiving supportive care. This is the first confirmed case of 2016 affecting a Minnesota horse. For more information go to:
August 03, 2016 Eastern Equine Encephalitis Jackson and Jefferson Counties, FL Confirmed Case(s): No Quarantine
On August 3, two new EEE case were confirmed, one each in Jackson and Jefferson County, Florida. The Jackson County case, a 10 year old Quarter Horse, became clinical on July 16 and was last vaccinated against EEE in February 2016 per submitting veterinarian. The horse was euthanized for humane reasons the same day. The Jefferson County case has no previous vaccine history and no recent travel history. Clinical signs began on July 24 and the horse was euthanized for humane reasons three days later. This is the second confirmed EEE case in Jackson County, the third case in Jefferson County and cases 17 and 18 in Florida for 2016.
August 01, 2016 Eastern Equine Encephalitis Osceola and Highlands Counties, FL Confirmed Case(s): No Quarantine
On July 25, three new EEE case were confirmed in Florida, two in Osceola and one in Highlands County, Florida. Clinical signs began on July 12, 15 and 18. All horses had no recent travel history, no or unknown vaccine history and all were euthanized for humane reasons. This is the third and fourth confirmed EEE cases in Osceola County, the first case in Highlands County and cases 14, 15 and 16 in Florida for 2016.
August 01, 2016 Potomac Horse Fever Frederick County, MD Confirmed Case(s): No Quarantine
Potomac Horse Fever has been confirmed in two horses in Frederick County, Marlyand, one of which has died from the disease. Both horses had been vaccinated. The second horse is being treated by a private veterinarian and is expected to recover. For more information go to:
July 28, 2016 West Nile Virus Carter County, OK Confirmed Case(s): No Quarantine
The first reported WNV positive horse has been confirmed for 2016 in Oklahoma. The 4 year old QH mare located in Carter County was showing mild neurologic signs including hind limb ataxia. Vaccination history is unknown.
July 27, 2016 Eastern Equine Encephalitis Greenville and Horry Counties, SC Confirmed Case(s): No Quarantine
The State Veterinarian’s office received laboratory confirmation of two new equine cases of EEE on 7/26/16. One of these cases is in Greenville County and is the first confirmed case in the Upstate in 2016. This confirmation comes after the first confirmed case in the Midlands in Kershaw County the week of 7/15/16, providing solid evidence that the risk to SC horses from EEE at this time is not confined to our coastal counties but is indeed statewide. The Greenville county case was a 10-year-old QH. The second new case was a 5-year-old QH in Horry County. This is the 4th confirmed case in Horry County in 2016. Neither of these horses had been vaccinated according to label instructions and neither survived. The total number of confirmed cases in SC in 2016 is now 11.
July 26, 2016 West Nile Virus Yakima County, WA Confirmed Case(s): No Quarantine
The Washington State Department of Agriculture (WSDA) is reporting that a two-year-old Andalusian mixed breed mare in Yakima County is the first horse in Washington to contract West Nile virus this year. The horse was not vaccinated for the disease and is showing neurologic signs of the illness including stumbling and difficulties eating. For more information go to
July 22, 2016 West Nile Virus Garden County, NE Confirmed Case(s): No Quarantine
The first case of equine WNV has been reported to Nebraska Department of Agriculture. The horse was a 3 year old, unvaccinated quarter horse mare from Garden County NE. The horse was neurologic and unresponsive to treatment and was euthanized.
July 22, 2016 Eastern Equine Encephalitis Chesapeake County, VA Confirmed Case(s): No Quarantine
The Virginia Department of Agriculture and Consumer Services (VDACS) today announced the third case of Eastern Equine Encephalitis (EEE) in a Virginia horse this year. The horse, a mare from Chesapeake, contracted the disease one day and died the next. Vaccination history is unknown. All three horses have been from the Tidewater area. For more information go to: