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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
November 24, 2017 Equine Herpes Viruses Warren County, NJ Quarantine Released
Source: New Jersey Department of Agriculture

On November 2, 2017, a 25 year-old Quarter Horse mare in Warren County NJ was euthanized due to Equine Herpes Myeloencephalopathy (EHM).  The premises was quarantined, biosecurity measures and health monitoring were implemented.  Today, November 24, 2017 the quarantine was lifted since no additional horses have become sick.  There are no other premises in NJ under quarantine for EHM at this time. The New Jersey Department of Agriculture reminds the horse community that EHM, like other diseases affecting horses’ neurological systems such as Rabies, Eastern Equine Encephalitis and West Nile Virus, must be reported to the state veterinarian within 48 hours of a positive diagnosis.

November 24, 2017 Equine Infectious Anemia Havelock, QC Confirmed case(s): Quarantine
Source: Canadian Food Inspection Agency

On November 21, 2017, a positive Equine Infectious Anemia (EIA) result was confirmed by the Canadian Food Inspection Agency’s (CFIA) national reference laboratory for a horse on a premises in Havelock, Quebec. This animal had been sampled by an accredited veterinarian prior to it being moved to a new premises; clinical signs of the disease were not reported. A CFIA investigation is underway and as per program policy, a quarantine has been placed on the infected animal and its on-premise contacts. The quarantine will remain until all disease response activities have been completed on the premises, including follow-up testing and ordering the destruction of positive cases. More details on Equine Infectious Anemia can be found here<https://linkprotect.cudasvc.com/url?a=http://www.inspection.gc.ca/animals/terrestrial-animals/diseases/reportable/eia/eng/1329698749489/1329703176989%3finf_contact_key%3d54e78925928c29e33ff54664f4a0371edba627548a370fb5f23f05b488b6f3c5&c=E,1,NuFFUd6zxtivczRFF_orHgKQpfttFMAzZjLhFqodPi-P4_pfqGEEnJerseOyhJfY2Zh9hydp0dxqAZoScvUjCy19U4dJkacEdm4_rwOfUXUk&typo=1>.

November 22, 2017 West Nile Virus Muskogee County, OK Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food and Forestry

The Oklahoma Department of Agriculture, Food and Forestry confirmed West Nile Virus in a 2-year old Thoroughbred filly located in Muskogee County. The horse was showing mild neurologic signs and was not vaccinated.  For more information visit: http://www.ag.ok.gov.

November 17, 2017 West Nile Virus Greenwood County, SC Confirmed Case(s): No Quarantine
Source: South Carolina State Veterinarian

The South Carolina State Veterinarian’s office has received NVSL confirmation for the first West Nile Virus (WNV) case in Greenwood County. The case was a 14 year old gelding with unknown vaccination status and was euthanized.

November 16, 2017 Equine Herpes Viruses Coos Bay, OR Outbreak Update
Source: College of Veterinary Medicine at Oregon State University

The horse affected with Equine Herpesvirus Myeloencephalitis at Oregon State University had a negative nasal swab on November 13, 2017Because this affected horse is stable and not shedding the virus, it will be released to the owner's private barn this week. There has been no confirmed transmission to any other horses in the veterinary hospital and they will remain in quarantine until November 27, 2017.

November 15, 2017 Pigeon Fever King County, WA Confirmed case(s): Quarantine
Source: Washington State department of Agriculture

The Washington State Department of Agriculture has 3 positive horses confirmed for Pigeon Fever near the towns of Duvall and Carnation in King County. The 3 horses are a 15 year old Paint gelding, a 14 year old Halflinger cross gelding and a 25 year old Tennessee walker mare.  The horses are under the direct supervision of a veterinarian where biosecurity and treatment measures are being managed at this time.  The horses are under a voluntary hold order.

November 14, 2017 Equine Herpes Viruses Warren County, NJ Outbreak Update
Source: New Jersey Department of Agriculture

On November 8, 2017, the New Jersey Department of Agriculture confirmed Equine Herpes Myeloencephalopathy (EHM) in a 25-year-old Quarter Horse mare in Warren County, NJ.  The mare was euthanized on November 2, 2017.  All horses at the premises are quarantined.  Biosecurity measures were implemented, and horses are being monitored.  No other horses have shown signs of EHM.  Exposed horses that attended shows are in good health.  Organizers of the events attended by these horses have been contacted directly, and attendees have been notified about the possible exposure.  Concerned owners should contact their veterinarians.

November 13, 2017 West Nile Virus Graves County, KY Confirmed Case(s): No Quarantine
Source: Kentucky Department of Agriculture

On November 9, 2017, the Kentucky Department of Agriculture confirmed West Nile Virus in a female Quarter Horse cross in Graves County.  The mare had facial and shoulder twitching and had not vaccination history.  This is the 16th case of WNV in Kentucky in 2017.

November 13, 2017 Potomac Horse Fever Lewis, WA Confirmed Case(s): No Quarantine
Source: Attending Veterinarian

An attending veterinarian has confirmed two cases of Potomac Horse Fever in horses located in Lewis, Washington. Clinical signs appeared on 10/18/2017. Two horses were affected, one was euthanized, the other is receiving treatment.

November 13, 2017 West Nile Virus Muskogee County, OK Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture, Food and Forestry

The Oklahoma Department of Agriculture, Food and Forestry confirmed the 6th reported WNV positive horse for 2017 in Oklahoma. The 5 year old Tennessee Walker gelding located in Muskogee County was showing severe neurologic signs and was euthanized.  The horse was not vaccinated.  A quarantine was not issued.  For more information visit: http://www.ag.ok.gov