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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
July 30, 2015 West Nile Virus Alamosa and Boulder Counties, CO Information Only
West Nile Virus (WNV) has been diagnosed in Colorado in two counties – Alamosa and Boulder. Th?ese? cases?? ?have?? been recently diagnosed by Colorado State University Veterinary Diagnostic Laboratory (CSUVDL) in Fort Collins. Neither of the horses were vaccinated for WNV. See
July 30, 2015 Eastern Equine Encephalitis Newton, Orange, Liberty, Jasper and Jefferson Counties, TX Information Only
AUSTIN - The Texas Animal Health Commission (TAHC) recently received confirmation from the Texas A&M Veterinary Medical Diagnostic Laboratory (TVMDL) of Texas horses testing positive for Eastern Equine Encephalitis (EEE). The infected horses are located in: Newton, Orange, Liberty, Jasper and Jefferson counties. To date, there are a total of five positive EEE cases in Texas. Go to
July 28, 2015 Eastern Equine Encephalitis Holmes and Madison Counties, FL Information Only
Three new cases of EEE were confirmed Holmes, Marion and Madison Counties within Florida with date of onset ranging between July 16th to July 19th. The test results returned positive for all cases on July 24th. Two horses were 2 year olds and the other was a 5 year old. All horses had not traveled within the past month and none had ever received vaccinations. One horse was euthanized due to poor prognosis at time of initial exam and the other two passed on due to natural causes. This is the first occurrence for Holmes county and the second occurrence for Marion and Madison counties for the 2015 calendar year.
July 25, 2015 Vesicular Stomatitis Ward county, TX Quarantine Ended
AUSTIN - Texas Animal Health Commission (TAHC) officials have released all premises quarantined for Vesicular Stomatitis (VS) in Texas. The final premises was in Ward County, approximately 30 miles north of Fort Stockton, TX. The two affected premises in Reeves and Pecos County were previously released. Several states and countries may still impose enhanced entry requirements on VS susceptible livestock coming from Texas. Producers are encouraged to contact the state of destination for official requirements. For international export information, the USDA Veterinary Services office in Austin, Texas should be contacted.
July 24, 2015 West Nile Virus Kennewick, WA Information Only
July 21, 2015-- The Washington State Department of Agriculture (WSDA) is reporting that a five-year-old Quarter horse gelding in Kennewick is the first equine in the state to contract West Nile virus this year. The horse, which was not vaccinated for the disease, has not left the owner’s property recently. The horse’s status is improving. The Washington Animal Disease Diagnostic Laboratory in Pullman, operated by Washington State University, reported the positive test results to WSDA’s State Veterinarian’s Office Friday. Washington had five confirmed cases of horses with West Nile virus last year, including horses in Benton, Franklin, Grant, Okanogan and Yakima counties. West Nile virus is spread by mosquitoes that have fed on infected birds. The disease sickens people, horses, birds and other animals, but it does not spread directly from horses to people or other animals. The disease is fatal to horses in about a third of the cases in which clinical signs are apparent, although most horses do not become ill and show no symptoms. Horses that do become ill can appear to be displaying loss of coordination, loss of appetite, confusion, fever, stiffness, and muscle weakness, particularly in their hindquarters. State Veterinarian Dr. Joe Baker recommends spring as the best time to vaccinate horses against West Nile virus or obtain an annual booster shot. However, horses may still benefit from first-time vaccinations or an annual booster shot. Horse owners not up to date on shots may benefit from a visit with their veterinarian to determine a vaccination protocol that best fits their situation.
July 24, 2015 Vesicular Stomatitis Cheyenne, WY Confirmed case(s): Quarantine
CHEYENNE, Wyo. (AP) — A horse in Wyoming has tested positive for a virus that can cause painful sores in infected animals. Wyoming Livestock Board officials said Thursday the horse that tested positive for vesicular stomatitis is the first case diagnosed in the state this year. Several cases in horses and cattle have been found in Colorado, New Mexico, Texas and Arizona. The virus also can threaten sheep, goats and pigs. The affected horse had been at Cheyenne Frontier Days before the virus was discovered but officials say it was not near any contestant horses. Officials put the horse under quarantine and sent it back to its home in Wyoming to be held in isolation.
July 18, 2015 Eastern Equine Encephalitis Barnwell county, SC Information Only
South Carolina’s state veterinarian has confirmed the first 2015 case of Eastern Equine Encephalitis (EEE) in the state in 2015. An unvaccinated horse died from the disease in Barnwell County.
July 17, 2015 Vesicular Stomatitis Montrose, Delta, Montezuma, La Plata, Las Animas and Larimer counties, CO Confirmed case(s): Quarantine
Two new counties in Colorado have VSV confirmed cases. All affected premises are quarantined for 14 days. Currently Montrose, Delta, Montezuma, La Plata, Las Animas and Larimer counties have positive VSV cases that are under the 14 day quarantine.
July 15, 2015 Vesicular Stomatitis Plata county, CO Confirmed case(s): Quarantine
La Plata County is a new affected county in Colorado. One premises in this county has been quarantined for fourteen days.
July 13, 2015 Eastern Equine Encephalitis Washington, Putnam and Polk counties, FL Information Only
July 13, 2015-Three new cases of EEE were confirmed Washington, Putnam and Polk Counties within Florida. All three horses were adults between 5 and 7 years old and had not traveled within the past 6 months. Two of the horses were previously unvaccinated and were euthanized due to poor prognosis at time of initial exam. The third horse had been vaccinated in the past but not within the last year. The 6 year old miniature was still standing but lethargic and had cranial verve deficits according to the treating DVM. Supportive care was being given for the fifth day since clinical signs occurred. This is the first occurrence for Washington county and the second occurrence for Polk and Putnam counties for the 2015 calendar year.