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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 23, 2016
West Nile Virus
Shasta County, CA
Confirmed Case(s): No Quarantine
On September 22, 2016, a 10 year old Quarter Horse gelding in Shasta County, California displaying neurologic signs was confirmed positive for West Nile Virus (WNV). The vaccination status of this horse is unknown. The gelding is recovering. For 2016, a total of nineteen (19) horses have been confirmed positive for WNV in California. Seven of the nineteen positive confirmed horses died or were euthanized. CDFA continually monitors and investigates equine neurologic cases for the presence of WNV in California. CDFA urges horse owners to consult their veterinarian concerning a WNV vaccination program to ensure maximum protection of their horses. For more information visit: https://www.cdfa.ca.gov/ahfss/animal_health/wnv_info.html
September 23, 2016
West Nile Virus
Morrison County, MN
Confirmed Case(s): No Quarantine
The Minnesota Veterinary Medical Association has reported the 16th case of WNV this year. The unvaccinated QH gelding, located in Morrison County, was first observed showing clinical signs on September 8th and is still alive though unable to stand without assistance.
September 22, 2016
West Nile Virus
Bourbon County, KY
Confirmed Case(s): No Quarantine
Results of diagnostic testing received from the University of Kentucky’s Veterinary Diagnostic Laboratory has today confirmed Kentucky’s 3rd equine West Nile case of the year. The unvaccinated 3 year old Standardbred mare presented with acute lethargy, general weakness and ataxia, mild muscle fasciculation in neck and chest area on September 18th and was hospitalized on September 20th. The horse continues to receive supportive care at the hospital today and is reported to be in a stable condition. For more information go to www.kyagr.com/statevet/equine-infectious-diseases.html#west
September 21, 2016
West Nile Virus
Mineral County, WV
Confirmed Case(s): No Quarantine
The West Virginia Department of Agriculture has reported a case of West Nile Virus confirmed on September 20th. The 6 year old QH mare located in Mineral County showed severe, acute neurologic symptoms but is still alive. Vaccination status is unknown.
September 21, 2016
Potomac Horse Fever
Hampshire County, WV
Confirmed Case(s): No Quarantine
The West Virginia Department of Agriculture confirmed a case of Potomac Horse Fever on September 20th in Hampshire County. The 6 year old QH gelding was febrile, lethargic, and passing loose stool. Vaccination status is unknown; the horse is alive.
September 21, 2016
West Nile Virus
Cochise County, AZ
Confirmed Case(s): No Quarantine
A horse in Cochise County has tested positive for West Nile Virus (WNV), marking the first detection of the disease in Arizona for the 2016 season. The affected horse is a 4-year old Quarter Horse gelding with no history of vaccination for WNV. The horse exhibited advancing medical signs and was euthanized.
September 20, 2016
Eastern Equine Encephalitis
Clare and Menominee Counties, MI
Confirmed Case(s): No Quarantine
As of September 20, the Michigan Department of Agriculture and Rural Development (MDARD) has identified two cases of Eastern equine encephalitis (EEE). On September 15, 2016, the Michigan Department of Agriculture and Rural Development was notified that a four month old Standardbred filly in Clare County tested positive for Eastern Equine Encephalitis (EEE). The filly had developed a sudden fever, was staggering and eventually unable to rise. The filly was not vaccinated against EEE and did die. On September 16, Michigan's second case of EEE was identified in a 12-year-old, Quarter Horse mare in Menominee County. The horse had a fever, was not eating or drinking, and was leaning against walls. The unvaccinated mare later died.For more information visit www.michigan.gov/equinediseases.
September 20, 2016
Eastern Equine Encephalitis
Sumter County, FL
Confirmed Case(s): No Quarantine
On September 19, a new EEE case was confirmed in Sumter County, Florida. The 11 year old Quarter Horse mare was last vaccinated for EEE in late Summer 2015 per the owner and had no recent travel history. Clinical signs began on August 13 and the horse was euthanized for humane reasons later the same day. This is the first confirmed EEE case in Sumter County and case 20 in Florida for 2016.
September 19, 2016
West Nile Virus
Stevens, Spokane, Grant, Kittitas, Franklin, Pend Oreille, and Okanagon Counties, WA
Confirmed Case(s): No Quarantine
The Washington State Department of Agriculture has documented nine confirmed cases of West Nile Virus so far in September. None of the horses were vaccinated. - A 7 year old QH mare in Stevens County was confirmed positive on 9/1; prognosis is good. - A cross breed gelding in Spokane County was confirmed positive on 9/3; prognosis is good. - A 12 month old QH cross filly in Stevens County was confirmed positive on 9/4 and has passed away. - A 2 year old Arabian colt in Grant County was confirmed positive on 9/6; prognosis is good. - A 17 year old gelding in Kittitas County was confirmed positive on 9/7; prognosis is good. - A 13 year old Paint gelding in Franklin County was confirmed positive on 9/12; euthanized. - A 6 year old QH mare in Pend Oreille County was confirmed positive on 9/11; prognosis is fair. - A 23 year old Arab cross mare in Okanogan County was confirmed positive on 9/11 and was euthanized. - A 5 year old Arab cross mare in Spokane County was confirmed positive on 9/13; prognosis is good.
September 19, 2016
Eastern Equine Encephalitis
Vilas County, WI
Confirmed Case(s): No Quarantine
An unvaccinated, 12-year-old, Quarter Horse mare seen on 9/7/16 in Vilas County, was fourth confirmed equine case of EEE in Wisconsin in 2016. The mare was febrile, unable to rise, and unresponsive with various neurologic signs including extensor rigidity, struggling, nystagmus, intermittent tonic-clonic activity and frequent tooth grinding. The attending veterinarian humanely euthanized the mare.