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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.


October 05, 2016
West Nile Virus
Benton County, MN
Confirmed Case(s): No Quarantine
The Minnesota Board of Veterinary Medicine has confirmed a 19th case of WNV in Benton County. The vaccinated 22 year old QH gelding began showing hind leg incoordination on August 16th and was just recently diagnosed due to persisting clinical signs. The horse continues to show hind leg incoordination when carrying a rider.
October 05, 2016
Eastern Equine Encephalitis
Waupaca, Langlade, Monroe, Chippewa, Eau Claire, Taylor, Forest Counties, WI
Confirmed Case(s): No Quarantine
Wisconsin has had 7 additional confirmed cases of EEE. All of the horses have been euthanized or died on their own. All are nonvaccinates or under vaccinated. Waupaca County: 8-yr.-old Quarter Horse mare, not vaccinated; staggering and went down vocalizing with its tongue out. Euthanized 9/21/16. Langlade County: 11-yr.-old Quarter Horse mare, not vaccinated this year; became non-ambulatory with a wry neck and was beginning to seizure. Euthanized 9/25/16. ELISA IgM: Positive at 1:400 Monroe County: 2-yr.-old Quarter Horse mare, either nonvaccinated or under vaccinated; head-pressing, lethargic, ataxic. Euthanized 9/18/16. PCR Positive CT Value 24.4 Chippewa County: 1-yr.-old under-vaccinated (no vaccine this year) Thoroughbred filly; initially presented 9/24/16, febrile, depressed, lethargic, weak, nystagmus, seizure-like activity; went down 9/26 and died 9/27. Eau Claire County: 8-yr.-old under-vaccinated (possibly vaccinated 5 yrs. ago) Miniature Horse mare; presented 9/26/16, wobbly, depressed, decreased appetite, circling to left, twitching, and head pressing; went down late 9/28; euthanized 9/29 Taylor County: 13-yr.-old-unvaccinated Percheron mare; symptoms began 9/23/16 (hind limb weakness, stumbling; went down and was euthanized 9/24/16. Forest County: Miniature Horse, Vaccination history unknown This makes 17 confirmed positive equine EEE cases in WI this year
September 28, 2016
West Nile Virus
Hennepin County, MN
Confirmed Case(s): No Quarantine
The Minnesota Board of Veterinary Medicine has confirmed an 18th case of West Nile Virus for 2016. The 14-15 year old QH mare, located in Hennepin County, was found down in pasture and was unable to rise; the mare was vaccinated 5 days prior to being euthanized and had no previous vaccination status.
September 28, 2016
West Nile Virus
Spokane and Stevens County, WA
Confirmed Case(s): No Quarantine
The Washington Animal Disease Diagnostic lab has confirmed two more cases of West Nile Virus. A 6 month old QH filly with no vaccination history was confirmed positive in Spokane County; prognosis is good. A 10 year old QH mare with unknown vaccination history was confirmed positive in Stevens County; prognosis is good.
September 28, 2016
West Nile Virus
Olmstead County, MN
Confirmed Case(s): No Quarantine
The Minnesota Board of Veterinary Medicine has confirmed the 17th case of West Nile Virus for 2016. The 18 year old QH mare was first observed showing clinical signs on September 15th in Olmstead County. The mare was unvaccinated but is recovering.
September 28, 2016
West Nile Virus
Grant and McClain Counties, OK
Confirmed Case(s): No Quarantine
The Oklahoma Department of agriculture has confirmed two more WNV positive horses today bringing the total up to 5 for 2016. A yearling QH stallion, located in Grant County was showing severe neurologic signs. Vaccination history is unknown. A yearling QH filly, located in McClain County, was showing severe neurologic signs and was euthanized. Vaccination history is unknown.
September 26, 2016
Eastern Equine Encephalitis
Waupaca County, WI
Confirmed Case(s): No Quarantine
The Wisconsin Department of Agriculture has confirmed an 10th case of equine EEE for 2016. The 8-year-old, unvaccinated, Standardbred mare from Waupaca County was ataxic before going down on 9/17. She was non-responsive with nystagmus and died that night
September 26, 2016
West Nile Virus
Jefferson County, WI
Confirmed Case(s): No Quarantine
The Wisconsin Department of Agriculture has reported a new case of WNV. The unvaccinated 5 year old Paint mare, located in Jefferson County, presented on September 10th with muscle fasciculations, rear weakness, and knuckling over of the left hind, and had a fever early on. The mare was sampled on September 15th, confirmed positive on September 23rd and is doing well at this time. This makes for 7 Equine WNV Cases in WI for 2016.
September 26, 2016
Eastern Equine Encephalitis
Forest, Lincoln, Clark, Langlade Counties, WI
Confirmed Case(s): No Quarantine
The Wisconsin Department of Agriculture has reported five new cases of EEE. All were confirmed late on September 23rd. Forest County: 8-yr.-old Saddlebred mare, unvaccinated; presented with fever, ataxia, blindness, unresponsive; euthanized September 14th. Lincoln County: 4-yr.-old Quarter Horse gelding, unvaccinated; presented September 14th with occasional paddling, seizures, cortical blindness, ataxia, bruxism, exaggerated eye responses; unresponsive, euthanized on September 15th. Lincoln County: 18-yr.-old Quarter Horse mare, no vaccination this year (unsure previous years); presented September 19th with ataxia, minimally responsive, bruxism, blindness; injuring itself; euthanized September 20th. Clark County: 8-yr.-old grade gelding, unvaccinated; presented down and unresponsive on September 20th; died despite treatment September 23rd. Langlade County: 12-yr.-old grade stallion, unvaccinated; presented September 13th recumbent, depressed, listless, coaxed to stand, but went back down; died September 14th. This makes a total of 10 Equine EEE Cases in Wisconsin for 2016.
September 23, 2016
West Nile Virus
Hart County, KY
Confirmed Case(s): No Quarantine
The Kentucky State Veterinarian’s Office has reported Kentucky’s 4th case of West Nile Virus located in Hart County. The unvaccinated 4 year old Standardbred mare presented with moderate rear limb ataxia, muscle fasciculation, lip paresis on September 15th. As of September 23rd the mare is reported as much improved with a prognosis of full recovery. Click the following link to view KY Dept. of Agriculture’s current summary (includes geographic reference map): http://www.kyagr.com/statevet/equine-infectious-diseases.html#west