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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 30, 2018
Strangles
Pierce County, WA
Confirmed Case(s): Voluntary Quarantine
Source: Washington State Department of Agriculture

The Washington State Department of Agriculture confirmed Strangles in a 17-year old Arabian gelding in Pierce, Washington. The horse had nasal discharge, a fever and had a positive culture. A second horse was exposed and both are in voluntary quarantine. The vaccination history is unknown.

 

October 29, 2018
West Nile Virus
Cuyahoga, Licking, Carroll, and Holmes Counties, OH
Confirmed Case(s): No Quarantine
Source: Office of the Ohio State Veterinarian

The Office of the Ohio State Veterinarian has reported five confirmed cases of equine West Nile virus. A 4-year-old Thoroughbred gelding from Cuyahoga County showed an onset of clinical signs on October 7th, 2018 when the trainer went to retrieve the horse from its stall and noticed it was lame on its right side. The track veterinarian responded and noticed that it was non-weightbearing with a fever of 102.4. The veterinarian suspected a high fracture, but the radiograph was negative. Symptoms progressed to a head tilt, muscle fasciculations in the neck and shoulders and then then horse went down. The horse was humanely euthanized and brought to the Ohio Department of Agriculture for a necropsy. After determining that brain tissue was negative for rabies, PCR assay at the Ohio ADDL detected West Nile Virus (WNV) nucleic acid in brain stem tissue of this horse. A 7-year-old Quarter Horse gelding from Licking County had an onset of clinical signs on 10/04/2018 when the owner noticed that the horse was dragging his left leg, lethargic, and had weakness in the rear legs. The days prior the horse had a lack of appetite. The veterinarian responded and found the horse down and treated the horse. A serum sample was collected and submitted to NVSL, they reported an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to West Nile Virus. The horse is alive and recovering as of 10/06/2018. A 10-year-old Paint gelding from Holmes County showed onset on 10/17/2018 when the attending veterinarian received a call for a down horse. Upon arrival the horse was laterally recumbent, couldn't rise and had a temperature of 100.8°F. A serum sample was collected and submitted to NVSL, they reported an IgM capture ELISA titer of 1:400 or greater, suggesting recent exposure to West Nile Virus. The horse died spontaneously that night. A 7-year-old Percheron mare from Holmes County showed an onset of clinical signs on 9/11/2018. The veterinarian received a call for a down horse that was agitated; the veterinarian treated the horse, but it died spontaneously that night. A serum sample was collected and submitted to IDEXX, they reported a positive IgM capture ELISA, suggesting recent exposure to West Nile Virus. A 16-year-old Paint gelding from Carroll County showed an onset of clinical signs when the owner found the horse down in the pasture in the afternoon on 10/19/2018, it struggled to rise. The veterinarian responded, and the horse was down with a fever of 100°F, HR 65, RR36 (irregular), full body muscle fasciculations, and had hyperesthesia. The veterinarian treated and collected a serum sample. The veterinarian was called back out the next day because the horse was down. A serum sample was collected and submitted to Cornell, which reported an IgM capture ELISA of 6.79 (>3.3 = Positive), suggesting recent exposure to West Nile Virus. The horse was euthanized on 10/20/18. None of the horses were vaccinated against WNV. This brings the total number of confirmed equine WNV cases in Ohio to 48.

 

October 29, 2018
West Nile Virus
Kent County, DE
Confirmed Case(s): No Quarantine
Source: Office of the Delaware State Veterinarian

The Office of the Delaware State Veterinarian has reported a confirmed case of equine West Nile virus. An unvaccinated yearling Standardbred filly in Kent County showed an onset of clinical signs on October 11th, 2018 including ataxia in all four limbs, buckling in the forelimbs progressing to recumbency, muscle fasciculations and somnolence. The horse was euthanized on 10/15/2018 following 60 hours of recumbency. Samples taken showed positive IgM capture ELISA, and positive PCR on necropsy.

 

October 26, 2018
West Nile Virus
Carlisle County, KY
Confirmed Case(s): No Quarantine
Source: Office of the Kentucky State Veterinarian

The Office of the Kentucky State Veterinarian has confirmed a case of equine West Nile virus. A 3-year-old Quarter Horse gelding on Carlisle County showed an onset of clinical signs on October 22nd, 2018 including lethargy and rear limb ataxia. On the evening of October 25th the horse was described as much improved with a favorable prognosis. WNV Vacc History is currently unknown. It is thought the horse might have received a single vaccination in the spring by another veterinarian. The attending veterinarian is checking to confirm if the patient was or wasn’t vaccinated.

October 25, 2018
Strangles
Municipality of North Grenville, ON
Confirmed case(s): Official Quarantine
Source: Canadian Animal Health Surveillance System

The Canadian Animal Health Surveillance System has reported a horse has tested positive for strangles in the township of North Grenville, Ontario. An 8 year old unvaccinated (Strangles) Quarter Horse mare presented with clinical signs of coughing, lethargy and pyrexia on September 27, 2018. Samples were taken for Strangles PCR and results were received on October 3, 2018 that she tested positive for Strep equi (Strangles). The mare has been kept in a quarantined paddock since the identification of clinical signs. Treatment with anti-inflammatories and antibiotics was initiated and she is recovering well. At this time, no other cases have been identified. https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.rideauvet.com&c=E,1,RnjT5eyUQ1BQI_6AmtNBjUMjK5nz6uQURrw1dx24Q8VaXnGBLBOVmJWCzrb4XoSU3h1KhzC2WsNJXv4kNKd9b_-Ay_Kdnt4jtv2-hiCEQRkgqjE,&typo=1

October 24, 2018
West Nile Virus
Barren County, KY
Confirmed Case(s): No Quarantine
Source: Office of the Kentucky State Veterinarian

The Office of the Kentucky State Veterinarian has confirmed a case of equine West Nile virus. A 7-year-old Quarter Horse mare with no vaccination history in Barren County showed an onset of clinical signs on September 9th, 2018 including fever, ataxia, and little tongue tone. The horse responded well to treatment and on 10/23 was described as fully recovered. This is the 13th case of equine WNV confirmed in KY for 2018.

 

October 24, 2018
Eastern Equine Encephalitis
Livingston and Chautauqua 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 two confirmed cases of equine Eastern Equine Encephalitis. A 3-year-old, unvaccinated mare from Nunda, NY (Livingston Co) began showing signs of hindlimb weakness on October 11th, 2018 which progressed over a few days. As of 10/19/18, she is alive and still showing signs of ataxia despite medical care. Blood samples confirmed her WNV infection. An 8-year-old, unvaccinated gelding from Clymer, NY (Chautauqua Co) became ill on October 13th, 2018. The owner reported that the horse was weak and stiff in limbs and acting abnormal. By 10/14 the horse was down, unable to use its legs. The horse was euthanized due to poor quality of life. Blood samples were taken and confirmed EEE infection.

 

October 24, 2018
West Nile Virus
Kent County, DE
Confirmed Case(s): No Quarantine
Source: Office of the Delaware State Veterinarian

The Office of the Delaware State Veterinarian has confirmed one case of West Nile Virus in Kent County. A 6-year-old, unvaccinated Belgian mare displayed neurological clinical signs from October 12-18, 2018. Diagnostic testing at the National Veterinary Services Laboratory confirmed WNV on 10/23/18. The mare displayed whole body stiffness (acting sore), and abnormal mentation, described as extreme aggression towards the reporting veterinarian during handling. The aggression was atypical for this animal, which is normally very gentle. When first seen on 10/14/18, the horse was afebrile, was not ataxic, was not weak or wobbly, and was lacking notable muscle fasciculations. With 3-4 days of anti-inflammatory treatment, the horse improved markedly and was back to normal by 10/18/18.

October 24, 2018
Equine Herpesvirus
Maricopa County, AZ
Confirmed case(s): Official Quarantine
Source: Arizona State Veterinarian

On October 19, 2018 the Arizona State Veterinarian confirmed Equine Herpesvirus Myeloencephalopathy (EHM) in a yearling filly which exhibited neurological signs in Maricopa County.Another yearling on the property had been to an event 3 weeks prior and was showing neurologic signs, but at this time has tested negative for EHV. The facility in Maricopa county was placed under quarantine for EHM. A hold order was placed on the facility on October 20th. Temperatures are being monitored twice a day for the duration of the quarantine. Any horse that displays fever or clinical signs compatible with EHM will be reported to the State Veterinarian and will be tested. The event organizer where the yearling was exhibited was notified, and will reach out to contestants to recommend enhanced observation of horses and to increase biosecurity measures.

October 19, 2018
West Nile Virus
Magoffin County, KY
Confirmed Case(s): No Quarantine
Source: Office of the Kentucky State Veterinarian

The Office of the Kentucky State Veterinarian has reported a confirmed case of equine West Nile virus. A  5-year-olf Kentucky Mountain Horse gelding in Magoffin County with no vaccination history presented on October 10th, 2018 with muscle fasciculation, lethargy,  and inappetence. As of 10/17 the horse was described as much improved and does have a favorable prognosis