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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.


August 11, 2017
West Nile Virus
Carbon County, UT
Confirmed Case(s): No Quarantine
Source: Utah Department of Agriculture and Food

On August 3rd the Utah Department of Agriculture and Food received Confirmation of WNV in a 2 year old Quarter Horse mare from Carbon County. On presentation, the horse was ataxic and exhibited hindlimb weakness. As of August 8th the horse had responded well to treatment and is expected to recover. This is the first WNV case for Utah in 2017.

August 10, 2017
West Nile Virus
Kern and Contra Costa Counties, CA
Confirmed Case(s): No Quarantine
Source: California Department of Food and Agriculture

On August 10, 2017, the California Department of Food and Agriculture reports, an unvaccinated 8 month old Quarter Horse filly in Kern County and an unvaccinated three year old Quarter Horse filly in Contra Costa County displaying severe neurologic signs were confirmed positive for WNV. The Kern County filly was euthanized due to the severity of the disease and the Contra Costa County filly is recovering. For 2017, a total of five (5) horses have been confirmed positive for WNV in California . For more information visit:https://www.cdfa.ca.gov/ahfss/animal_health/WNV_Info.html

August 10, 2017
West Nile Virus
Mecosta and Midland 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 that two additional Michigan horses have tested positive for West Nile virus (WNV).  A six-year-old Standardbred gelding from Mecosta County, which was last reported to be undergoing treatment, and a six-year-old Quarter Horse mare from Midland County, which was euthanized due to the severity of its condition. Both horses were unvaccinated and developed sudden neurologic signs, including being unsteady (ataxia) in all limbs. No quarantines were issued.

August 10, 2017
West Nile Virus
Larimer County, CO
Confirmed Case(s): No Quarantine
Source: Colorado Department of Agriculture

The Colorado Department of Agriculture confirmed its first case of West Nile Virus on August 9th. A horse residing in Larimer County was diagnosed by Colorado State University Diagnostic Laboratory on August 2nd. Vaccination history is unknown. For more information go to https://www.colorado.gov/pacific/agmain/news/892017-first-confirmed-case-2017-equine-west-nile-virus-wnv-colorado

August 10, 2017
West Nile Virus
St. Croix 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 received confirmation of its third positive equine West Nile Virus case on 8/9. The horse was an 8 year old unvaccinated Standardbred gelding from St. Croix County. He showed neurologic signs and was unable to rise when the veterinarian saw him and was subsequently euthanized.

August 05, 2017
Eastern Equine Encephalitis
Cabarrus, NC
Confirmed Case(s): No Quarantine
Source: North Carolina Department of Agricultrue and Consumer Services

On August 3rd, the North Carolina Department of Agriculture confirmed a case of Eastern Equine Encephalitis in a 16 year old paint horse in Cabarrus County. The horse has died after contracting the virus. This is the first confirmed report of EEE in NC in 2017. For more information go to http://www.ncagr.gov/paffairs/release/2017/8-3-17-first-eee-case-of-year-in-horse.htm

August 02, 2017
West Nile Virus
Menifee County, KY
Confirmed Case(s): No Quarantine
Source: Kentucky Department of Agriculture

The Office of the Kentucky State Veterinarian confirmed a case of West Nile Virus on August 1st. The 18 year old Pleasure Saddle Horse mare in Menifee County presented on July 26th with severe rear limb ataxia, lethargy, and crossing the front legs. The horse, which had no WNV vaccination history, was euthanized on July 28th after its condition continued to deteriorate. For more information visit http://www.kyagr.com/statevet/equine-infectious-diseases.html#WNV

August 01, 2017
West Nile Virus
Clark County, WI
Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade, and Consumer Protection

The Wisconsin Departments of Agriculture, Trade, and Consumer Protection has reported its second confirmed case of WNV for 2017. A Standardbred mare, unknown age from Clark County, was euthanized on 7/24 after it was found unable to rise.  Sample results confirmed acute WNV. There was no known history of WNV vaccinations.

July 31, 2017
Eastern Equine Encephalitis
Monroe County, WI
Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade, and Consumer Protection

On July 28th the Wisconsin Department of Agriculture, Trade, and Consumer Protection received notice of two confirmed cases of EEE. Both affected horses were yearling fillies owned by the same owner residing in Monroe County. It was reported that both fillies were vaccinated in November 2016 and again in December 2016 but had not been vaccinated in 2017. One of the fillies died and one was euthanized after both showed severe neurologic signs.  Cases confirmed (PCR) at WVDL.  No quarantine was issued. These are the first cases of EEE reported in Wisconsin in 2017.

July 29, 2017
West Nile Virus
Jackson, Livingston, and Missaukee Counties, MI
Confirmed Case(s): No Quarantine
Source: Michigan Department of Agriculture and Rural Development

The Michigan Department of Agriculture and Rural Development received confirmation on July 28 that three Michigan horses tested positive for West Nile virus.  A 31 year old Arabian mare from Jackson County, an eight year old Arabian gelding from Livingston County and a 15 year old Standardbred gelding from Missaukee County developed severe neurologic signs which included incoordination, sweating, right sided facial paralysis, head pressing, paddling and an inability to stand. All three affected horses were euthanized. The vaccination history is unknown.