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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
August 16, 2017 West Nile Virus Kent, DE Confirmed Case(s): No Quarantine
Source: The Delaware Office of the State Veterinarian

The Office of the State Veterinarian today announced the Delaware’s first case of West Nile Virus (WNV) in a horse in 2017. The infected horse was an 11-year-old Quarter horse mare residing in Kent County. The horse began showing signs of weakness in all four limbs on August 6. The mare lost the ability to stand and was therefore euthanized on August 9. Samples were submitted to the Delaware Public Health Laboratory on August 10, which confirmed the diagnosis of WNV on August 14. The affected horse was not currently vaccinated against WNV. For more information go to http://news.delaware.gov/2017/08/15/west-nile-virus-confirmed-delaware-horse/

August 16, 2017 Equine Herpes Viruses Culpeper, VA Outbreak Update
Source: Virginia Department of Agriculture and Consumer Services

The Virginia Department of Agriculture and Consumer Services has reported that there are no new cases of EHM confirmed in Culpeper or elsewhere in Virginia. The Marion DuPont Scott Equine Medical Center is not under quarantine and is following strict isolation and biosecurity protocols for the recovering horse.  If no new cases occur, the farm will remain quarantined with no equids allowed on or off until September 4th. There had been no movement of horses off the premises in the month preceding the first diagnosed case on the farm. For more information go to http://www.vdacs.virginia.gov/press-releases-170816-ehv-1a.shtml

August 15, 2017 Eastern Equine Encephalitis Monroe County, WI Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade, and Consumer Protection

Wisconsin Department of Agriculture received confirmation of its third equine EEE case for 2017. The horse was an unvaccinated 9-year-old Quarter Horse mare from Monroe County.  The horse acted depressed during the afternoon of 8/6, then began showing neurologic signs and was down by that evening.  She was euthanized the next day.  No quarantine has been issued. All three of the confirmed WI EEE cases have been from Monroe County.

August 15, 2017 Equine Herpes Viruses Culpeper, VA Confirmed case(s): Quarantine
Source: Virginia Department of Agriculture and Consumer Services

On August 11th  a horse exhibiting neurologic signs was transported to the Marion duPont Scott Equine Medical Center in Leesburg, VA from a farm in Culpeper, VA. The horse was immediately isolated from the hospital population and has not come into contact with any other patients. On Aug. 12, the Virginia Department of Agriculture and Consumer Services’ (VDACS) Animal Health Lab in Warrenton confirmed a diagnosis of Equine Herpesvirus Myeloencephalopathy (EHM) due to EHV-1. The horse remains isolated while undergoing supportive care. On Aug. 14th, a second horse from the same farm developed a fever and neurologic symptoms and was euthanized. VDACS’ Animal Health Lab confirmed a diagnosis of EHM. The farm is under quarantine. The Marion duPont Scott Equine Medical Center employed strict biosecurity measures and disinfection upon arrival and will continue to do so during the entirety of the horse’s hospitalization. The Marion duPont Scott Equine Medical Center is operating normally.  For more info go to: http://www.vdacs.virginia.gov/animals-equine-herpes-virus.shtml and https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHM.pdf

August 14, 2017 Potomac Horse Fever Taylor, Woodford, Fayette, Bourbon, Scott, and Harrison Counties, KY Confirmed Case(s): No Quarantine
Source: University of Kentucky Veterinary Diagnostic Laboratory

The University of Kentucky Veterinary Diagnostic Laboratory has confirmed 28 cases of Potomac Horse Fever in 2017. 4 cases were confirmed in May, 9 in June, 9 in July, and 6 in August as of August 14th.  Positive samples were collected from horses in Taylor, Woodford, Fayette, Bourbon, Scott, and Harrison Counties. For more information go to http://vdl.uky.edu/EpidemiologyInformation/EquineMaps/PotomacHorseFever.aspx and https://aaep.org/guidelines/vaccination-guidelines/risk-based-vaccination-guidelines/potomac-horse-fever.

August 11, 2017 West Nile Virus Spokane County, WA Confirmed Case(s): No Quarantine
Source: Washington State Department of Agriculture

The Washington State Department of Agriculture was notified that a horse in Spokane County has tested positive for West Nile Virus. Testing was done at Washington State University’s Washington Animal Disease Diagnostic Laboratory. The unvaccinated 10 year old Quarter Horse was reported to have coordination problems in the hind legs and muscle tremors but is improving. This is Washington’s first confirmed case of WNV in 2017. For more information go to https://agr.wa.gov/news/2017/NR2017-08-09WashingtonConfirmsFirstEquineWestNileVirusCaseOf2017.aspx

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