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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
September 09, 2017 West Nile Virus Spokane, Lincoln, Benton Counties, WA Confirmed Case(s): No Quarantine
Source: Washington State Department of Agriculture

Washington State Department of Agriculture has 7 confirmed cases of West Nile Virus starting from August 8 to August 30, 2017 including the following: a 10-year-old unvaccinated QH gelding from Spokane County----recovering; an 8-year-old unvaccinated QH mare from Spokane County---recovering; a 10-year-old unvaccinated QH gelding from Lincoln County---status unknown; a 26-year-old unvaccinated QH gelding from Spokane County---recovering; a 7-year-old unvaccinated Draft horse mare from Spokane County---euthanized; a 28-year-old recently vaccinated Arabian mare from Spokane County---recovering; and 4-year-old unvaccinated QHX gelding from Benton County---euthanized.

September 08, 2017 West Nile Virus Bruce County, ON Confirmed Case(s): No Quarantine
Source: Ontario Ministry of Agriculture and Food

A 4-year old unvaccinated Quarter Horse mare from Bruce County, Ontario developed mild neurological signs due to West Nile Virus on August 27. Currently, the mare is receiving veterinary treatment. In 2017, the total number of confirmed WNV cases in Ontario is 7.

September 08, 2017 West Nile Virus Roscommon and Osceola Counties, MI Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

The Michigan Department of Agriculture and Rural Development has received confirmation of an unvaccinated, five-year-old, Tennessee Walker mare from Roscommon County testing positive for both West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE) (dually infected) and an unvaccinated, 20-year-old grade mare from Osceola County testing positive for WNV.  This brings the total number of Michigan horses confirmed with WNV to 13 (two from Wexford and one each from the following counties: Clinton, Livingston, Jackson, Mecosta, Midland, Missaukee, Montcalm, Ottawa, Osceola, Roscommon, and St. Joseph) and the total number of horses reported as confirmed with EEE to two (one each from Osceola and one from Wexford).

September 08, 2017 West Nile Virus Box Elder and Duchesne Counties, UT Confirmed Case(s): No Quarantine
Source: Utah Department of Agriculture and Food

On September 5th, the Utah Department of Agriculture received confirmation of WNV in an unvaccinated 6-year-old Percheron mare located in Box Elder County. She has been treated and is improving, On September 7th, WNV was confirmed in a vaccinated 6-year-old Quarter Horse mare and an unvaccinated Thoroughbred stallion, located at separate premises in Duchesne County. Both have been treated and are improving. For more information go to: https://www.arcgis.com/home/webmap/viewer.html?webmap=05d1052335224f0da04ba5d7d2738666&extent=-119.4205,35.2414,-102.0951,42.8078

September 07, 2017 Eastern Equine Encephalitis Monroe County, WI Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade, and Consumer Protection

The Wisconsin Department of Agriculture, Trade, and Consumer Protection has confirmed two new cases of Eastern Equine Encephalitis. Both horses, a 17-year-old Quarter Horse mare and a 2-year-old QH/Paint filly, were from Monroe County, were unvaccinated, and both were euthanized as a result. This brings the total to 10 EEE cases for 2017.

September 07, 2017 West Nile Virus Sauk, Dane, Oneida, Langlage, Outagamie, St. Croix, and Racine Counties, WI Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade, and Consumer Protection

The Wisconsin Department of Agriculture, Trade, and Consumer Protection has reported confirmation of six additional cases of equine WNV on September 6th. A 9-year-old, unvaccinated Percheron gelding from Sauk County was euthanized. A 23-year-old, unvaccinated QH gelding from Dane County is recovering. A 9-year-old, unvaccinated QH mare from Oneida County is recovering. A 5-year-old pony mare of unknown vaccination status, from Langlade County is recovering. An undervaccinated, yearling Arabian gelding from Outagamie County was euthanized. An 8-year-old, unvaccinated Belgian mare from St. Croix County is recovering. Another case was confirmed on September 7th in Racine County. The 7-year-old Arabian mare is recovering. This brings the total to 13 confirmed WNV cases for 2017.

September 07, 2017 West Nile Virus Boulder, Lincoln, Mesa, and Larimer Counties, CO Confirmed Case(s): No Quarantine
Source: Colorado Department of Agriculture

The Colorado Department of Agriculture has received reports of four additional cases of horses with West Nile Virus, bringing the total count to five in 2017.  Cases have been confirmed in the following Colorado counties:  Boulder, Lincoln, Mesa, and Larimer (2). 

September 05, 2017 Eastern Equine Encephalitis Cumberland County, NJ Confirmed Case(s): No Quarantine
Source: New Jersey Department of Agriculture

A 5-years old mare in Cumberland County, New Jersey was diagnosed with Eastern Equine Encephalitis. The mare was not vaccinated and died on August 28, 2017. This is the first reported case of EEE in New Jersey in 2017. 

September 02, 2017 Strangles Pickens County, GA Confirmed case(s): Quarantine
Source: Georgia Department of Agriculture

On September 1, a single premise in Pickens County, GA was placed under quarantine for a positive strangles culture. The index case developed clinical signs on August 26.

September 02, 2017 West Nile Virus Laurens, and Carroll Counties, GA Confirmed Case(s): No Quarantine
Source: Georgia Department of Agriculture

The Georgia Department of Agriculture has confirmed (1) additional case and (1) presumptive positive case of WNV in the following counties: Laurens (2 year, unvaccinated QH mare) and Carroll (4 year, unvaccinated TWH mare). Both horses presented with acute onset ataxia and difficulty rising. In one case, the horse recuperated with supportive therapy and in the second, presumptive positive case, the horse was euthanized due to progression of clinical signs. The 2017 total reported WNV cases in GA to date are 2 confirmed, 1 presumptive positive.