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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 19, 2018
Eastern Equine Encephalitis
Oswego County, NY
Confirmed Case(s): No Quarantine
Source: New York State Department of Agriculture and Markets

The New York State Department of Agriculture has reported a confirmed case of Eastern Equine Encephalitis. An unvaccinated 3-month old-filly from Williamstown, NY (Oswego Co) became ill around 9/24/18. She exhibited mild symptoms of ataxia for over a week before a vet was contacted. On 10/3/18, she was euthanized. Her brain was submitted for rabies, EEE and WNV testing. Her brain sample was positive for EEE virus.

October 19, 2018
West Nile Virus
Washington, Chenango, Livingston Counties, NY
Confirmed Case(s): No Quarantine
Source: New York State Department of Agriculture and Markets

The New York State Department of Agriculture has reported three confirmed cases of equine West Nile virus. A 14-year-old gelding from Ft. Edward, NY (Washington Co) with no history of WNV vaccination became ill on October 10th, 2018. As of 10/18, horse is alive and continues to be monitored under veterinary care. An 11-year-old mare from Bainbridge, NY (Chenango Co) who was up to date on many vaccines, except WNV vaccine became ill on 10/7/18. As of 10/17/18, horse is alive but still showing some ataxia/stiffness. A 37-year-old gelding from Avon, NY (Livingston Co) with no recent vaccine history became ill on 9/29/18. His health rapidly declined and was euthanized on 10/3/18. Serology confirmed active West Nile Virus infection in all three of those cases.

 

October 17, 2018
West Nile Virus
Lewis County, KY
Confirmed Case(s): No Quarantine
Source: Office of the Kentucky State Veterinarian

The Office of the Kentucky State Veterinarian has confirmed two cases of equine West Nile virus in Lewis County. A 20-year-old Tennessee Walking Horse gelding with no WNV vaccination history presented with rear limb ataxia, muzzle fasciculations, and inappetence on October 11th, 2018. On 10/16/18 the attending veterinarian reported patient is continuing to improve. A 17-year-old Tennessee Walking Horse mare with no WNV vaccination history showed an onset of clinical signs on 10/11/18 including ataxia and muzzle fasciculations. On 10/16 the attending veterinarian reported that the patient is continuing to improve. The Department of Agriculture’s Equine West Nile web page has been updated to reflect these additional two cases reported in 2018.

October 17, 2018
West Nile Virus
Smyth County, VA
Confirmed Case(s): No Quarantine
Source: Virginia Department of Agriculture and Consumer Services

The Virginia Department of Agriculture and Consumer Services (VDACS) has confirmed a case of equine West Nile virus in Smyth County. An unvaccinated, 22 year old Tennessee Walking Horse gelding developed an abnormal gait on 10/8/18. Serum from the horse was tested using by IgM Capture ELISA at the VDACS Warrenton Regional Animal Health Laboratory.The horse has slowly improved since onset with supportive therapy. This is the 4th case of equine WNV in Virginia  in 2018.

October 16, 2018
West Nile Virus
Trumbull, Holmes, Geauga, Ashtabula Counties, OH
Confirmed Case(s): No Quarantine
Source: Ohio Department of Agriculture

The Ohio Department of Agriculture has confirmed five new cases of equine West Nile virus (WNV). A 6-year-old Standardbred mare from Trumbull County had onset of clinical signs on September 19, 2018 when the owner called the veterinarian regarding a neurologic horse that was wobbly. Despite treatment, the next evening the horse was down and unable to rise so the owner elected euthanasia. A serum sample submitted to NVSL had an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to WNV. The horse was not vaccinated against WNV. An adult Standardbred gelding from Holmes County had clinical signs on 9/22/2018 when the owner called the veterinarian after driving his horse he noticed that it had weak rear limbs, was pulling to the right and was dragging his hoofs. The veterinarian noticed that the horse was agitated and had muscle fasciculations. Treatment was started immediately. A serum sample submitted to NVSL, had an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to WNV. The horse was not vaccinated against WNV. The horse is alive and recovering as of 09/24/2018. A 4-year-old Friesian gelding from Holmes County had clinical signs on 9/21/2018 when the owner called the veterinarian because his horse wasn’t eating, was refusing to move and had muscle fasciculations. The horse was vaccinated against WNV one week prior to showing symptoms. A serum sample submitted to NVSL, had an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to WNV. The horse is alive and recovering as of 09/24/2018. An adult Standardbred from Geauga County had signs on 09/24/2018. The owner called the veterinarian after noticing that his horse had stiff limbs and had stopped eating. The veterinarian responded, treated the horse and left medication with the owner. A serum sample submitted to NVSL, had an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to WNV. The horse was not vaccinated against WNV. The horse is alive and recovering as of 09/24/2018. An adult Standardbred gelding from Ashtabula County had signs on 09/29/2018. The owner called the veterinarian for a wobbly horse that was having difficulty standing. The veterinarian responded and treated the horse. A serum sample submitted to NVSL, had an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to WNV. The horse was not vaccinated against WNV and is alive and recovering as of 09/29/2018.

October 15, 2018
West Nile Virus
Oxford and Elgin Counties, ON
Confirmed Case(s): No Quarantine
Source: Ontario Ministry of Agriculture, Food and Rural Affairs

Between October 2 and October 11, 2018, the Ontario Ministry of Agriculture, Food and Rural Affairs was notified of three more positive test results for West Nile virus infection in horses. The three horses ranged in age from 5 to 12 years and all were female. Clinical signs included fever, ataxia, paralysis of one leg, muscle fasciculations and a saw-horse stance. One horse was euthanized and the others are recovering. Two of the horses were from Oxford County and the other was from Elgin County. The total number of cases in Ontario for the year is ten.

October 15, 2018
West Nile Virus
Anderson County, SC
Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian's Office

The South Carolina State Veterinarian's Office has confirmed the third case of equine West Nile virus in SC in 2018. A 15-year-old mare in Anderson County that had no recent vaccination history is now recovering. Quarantine was self-imposed by the owner. There are no other horses within 1 ½ miles. This is the second case of equine WNV in Anderson County.

October 12, 2018
West Nile Virus
Montgomery, Tompkins, Chenango, Chautauqua Counties, NY
Confirmed Case(s): No Quarantine
Source: New York State Department of Agriculture and Markets

The New York State Department of Agriculture and Markets has confirmed four cases of equine West Nile virus. A 1-year-old filly from Canajoharie, NY (Montgomery County) started exhibiting symptoms on September 23rd, 2018. She had been recently vaccinated but not for WNV. On September 29th, a 13-year-old mare from Newfield, NY (Tompkins County) started to exhibited neurological symptoms. She had no recent travel or vaccine history. A 9-year-old gelding from Afton, NY (Chenango County) became ill on September 30th. He had been vaccinated in Spring 2018 but not with a WNV vaccine. A 7-year-old stallion from Clymer, NY (Chautauqua County) became ataxic on September 28th. The stallion has no vaccine history and travels in the local area. All four horses are in various stages of recovery. In all 4 cases, blood samples confirmed active WNV infection.

October 09, 2018
West Nile Virus
San Joaquin and Merced Counties, CA
Confirmed Case(s): No Quarantine
Source: California Department of Food and Agriculture

In the first week of October, the California Department of Food and Agriculture confirmed its 9th and 10th equine West Nile Virus cases for 2018. On October 1, 2018, a 6 year old Quarter Horse gelding with unknown vaccination status, in San Joaquin county, displaying neurologic signs was confirmed positive for West Nile Virus. The gelding was euthanized due to severity of neurologic symptoms. On October 4, 2018, a 2 year old vaccinated Quarter Horse mare in Merced county, displaying neurologic signs was confirmed positive for West Nile Virus. The mare is alive and recovering. For 2018, a total of ten (10) horses have been confirmed positive for West Nile Virus. The positive horses were located in Amador, Kern, Merced (2), Placer, Sacramento (2), San Joaquin, Shasta and Stanislaus counties. Five (5) horses were unvaccinated, two (2) horses had an unknown vaccine history, and three (3) horses were vaccinated. Five (5) horses died or were euthanized and five (5) horses are alive. For more information on California equine WNV cases for 2018 visit https://www.cdfa.ca.gov/ahfss/Animal_Health/WNV_Info.html

October 09, 2018
West Nile Virus
Surry County, NC
Suspected Case(s): No Quarantine
Source: North Carolina Department of Agriculture and Consumer Services

The North Carolina Department of Agriculture and Consumer Services received notification of a presumptive diagnosis of West Nile Virus (WNV) in an unvaccinated horse in Surry County. A presumptive diagnosis is made based on compatible clinical signs and serology.