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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
April 06, 2017 Strangles Marion County, FL Confirmed case(s): Quarantine
On April 5, one premise in Marion County, Florida was placed under quarantine for strangles due to clinical signs and positive test confirmation. The index case became clinical on March 23 and samples were taken March 30. The index is the only horse on the premises currently displaying clinical signs. An epidemiological investigation is currently in progress. This the fifth case for Marion County and case 15 for Florida in 2017.
April 05, 2017 Equine Herpes Viruses Anne Arundel County, MD Outbreak Update
Source: Virginia Department of Agriculture

On April 2, a horse exhibiting neurologic signs was transported to the isolation facility at Marion duPont Scott Equine Medical Center in Leesburg, Virginia from Anne Arundel County, Maryland. The horse was euthanized shortly after arrival. On April 4, the Virginia Department of Agriculture and Consumer Services’ (VDACS) Animal Health Lab in Warrenton, Virginia confirmed a diagnosis of Equine Herpesvirus-1 (EHV-1). The Marion duPont Scott Equine Medical Center employed strict biosecurity measures and disinfection upon arrival and during the horse’s hospitalization. As a result, no horses in Virginia were exposed. The Equine Medical Center is operating normally. For more information go to: http://www.vdacs.virginia.gov/animals-equine-herpes-virus.shtml or contact VDACS’ Office of Veterinary Services at 804.786.2483.

April 05, 2017 Strangles Sanpete County, UT Confirmed case(s): Quarantine
Source: The Bureau of Land Management

The Bureau of Land Management (BLM) and the Axtell Contract Off-Range Corrals have issued a voluntary quarantine of wild horses at the facility due to an outbreak of upper respiratory tract infection. Individual infected animals are being tested for the exact cause, but early diagnosis indicates “strangles”. BLM officials have notified the Utah State Veterinarian of the outbreak, who visited the facility. Coordination is also occurring with Utah Veterinary Diagnostic Laboratory for testing of the infected horses. The Axtell facility staff began seeing signs of strangles on March 27. No mortality of horses has occurred from the localized outbreak, only clinical signs are being observed at this time. For more information go to https://www.blm.gov/press-release/horses-axtell-wild-horse-corrals-quarantined-until-further-notice

April 05, 2017 Equine Herpes Viruses Hunterdon and Somerset Counties, NJ Confirmed case(s): Quarantine
Source: The New Jersey Department of Agriculture

The New Jersey Department of Agriculture has quarantined properties in Hunterdon and Somerset counties after a horse developed highly infectious equine herpes myeloencephalopathy (EHM). No recent movement had occurred at the farm where the virus was reported prior to this case. The horse was moved into the isolation barn at a local animal hospital the evening EHM was confirmed. Both the horses at the original farm and the hospital are under quarantine. Nine horses were being treated at the hospital at the time of the incident; several horses were exposed to the ill horse. Seven of these horses will be moved to a remote facility, which also will be placed under quarantine so the hospital can be cleaned and disinfected in order to reopen. Other than the initial case, none of the quarantined horses at either location are showing clinical signs at this time. Both locations are taking the necessary biosecurity precautions to limit the spread of the virus. Temperatures also are being taken twice daily on all quarantined horses. For more information go to http://nj.gov/agriculture/news/press/2017/approved/press170404.html

April 04, 2017 Strangles Washington County, RI Confirmed case(s): Quarantine

Strangles has been diagnosed by an attending veterinarian of a boarding and training facility in Washington County, Rhode Island. The horses affected vary in age and gender and have displayed clinical signs including fever, cough, nasal discharge, and enlarged lymph nodes. Culture of a lymph node aspirate confirmed infection with Strep equi. The RI State Veterinarian issued an order of quarantine on April 4th for all equines housed at the facility. This facility houses horses owned by multiple owners and are cared for by multiple veterinarians. All attending veterinarians have been notified. At this point fewer than 10% of the horses have shown clinical signs.

April 04, 2017 Equine Herpes Viruses Anne Arundel County, MD Investigation Initiated

A horse stabled in Anne Arundel County in Maryland was transported to Marion duPont Scott Equine Medical Center in Leesburg, Virginia on the evening of April 2, where it exhibited severe neurological signs, was placed in isolation, and was euthanized shortly after arrival. A diagnosis of Equine Herpesvirus Myeloencephalopathy cause by the non-neuropathic strain of EHV-1 was confirmed on April 4 by the Virginia Department of Agriculture and Consumer Services’ Animal Health Lab in Warrenton, Virginia. The farm is presently under a 21-day investigational hold and strict biosecurity measures are in place while Maryland Department of Agriculture inspectors perform additional epidemiological and infectious disease testing. The stable owner is contacting boarders and students. Potential epidemiologic links to the sick horse are being notified of the situation and owners are cautioned to carefully monitor horses at their premises. For more information go to: http://news.maryland.gov/mda/category/mda-newsroom/. Additional information on Equine Herpesvirus Myeloencephalopathy go to: https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHM.pdf

March 30, 2017 Strangles Marion County, FL Confirmed case(s): Quarantine
On March 28 and 29, two premises, both in Marion County, Florida were placed under quarantine for strangles. The cases are unrelated. No horses have left either quarantined areas since clinical signs began. These are the third and fourth cases in Marion County and cases 13 and 14 for Florida in 2017
March 24, 2017 Equine Herpes Viruses Marion County, OR Confirmed case(s): Quarantine
A horse with neurologic signs was diagnosed with equine herpesvirus myeloencephalopathy (EHM) in Marion County Oregon. The horse began showing acute neurologic signs on Saturday March 18 and was immediately referred to Oregon State University-College of Veterinary Medicine (OSU-CVM). The diagnosis was made on March 20 by a positive test for both the EVH-1 wild type and neurotropic genetic markers. When horse’s condition deteriorated, it was euthanized. All horses at the Marion County property have been quarantined and strict biosecurity measures initiated. A second location in Marion County with a high-risk contact horse has also been quarantined. Quarantined horses are being closely monitored and there is no indication at this time that the virus has spread to other horses beyond those being quarantined, and there are no traces to other states. The Oregon Department of Agriculture will continue to work closely with all involved parties and is monitoring the situation very closely. Owners with questions about the neurologic form of EHV-1 should contact their veterinarian.
March 17, 2017 Strangles Nevada, United States Information Only
Source: The Nevada Department of Agriculture

The Nevada Department of Agriculture has reported that the spread of equine strangles has slowed significantly over the last two weeks; however there are reports of new cases, predominantly in western Nevada, as recently as March 12. For more information go to http://agri.nv.gov/News/2017/Spread_of_equine_strangles_has_slowed_in_Nevada/

March 17, 2017 Equine Herpes Viruses San Diego County, CA Quarantine Released
Source: California Department of Food and Agriculture

March 16, 2017: The quarantine at the San Diego County premises has been released as the Equine Herpesvirus Myeloencephalopathy case has met the negative test requirement for quarantine release. There are no EHM cases under quarantine in California at this time. For more information go to https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html