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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.


September 26, 2018
West Nile Virus
Clinton and Wapello Counties, IA
Confirmed Case(s): No Quarantine
Source: Iowa State Veterinarian

The Iowa State Veterinarian confirmed 2 new cases of West Nile Virus. On September 20, 2018 a 18-year old Belgian gelding in Clinton county had facial and chest muscle fasiculations, stiffness in the legs, muscle weakness in the hind limbs, ataxia and mild fever. The horse first developed posterior paresis on September 22nd and progressed to being recumbent the next day.  The horse was treated symptomatically, examined the following day and the owner elected to humanely euthanize on September 24th.  This mare was not vaccinated for WNV this year and had no previous history of WNV vaccination. A 3 year old Quarter Horse mare in Wapello county was examined on September 23, 2018.  The horse first developed posterior paresis on September 22nd and progressed to being recumbent the next day.  The horse was treated symptomatically, examined the following day and the owner elected to humanely euthanize on September 24th.  This mare was not vaccinated for WNV this year and had no previous history of WNV vaccination.

September 25, 2018
Equine Herpes Viruses
Loudon County, VA
Information Only
Source: Virginia Department of Agriculture, Office of Veterinary Services

On September 24, 2018 the Virginia Department of Agriculture, Office of Veterinary Services placed a small private farm in Loudoun County under quarantine for Equine Herpes Myelonencephalopathy (EHM). A hold order had been placed on the farm on September 21 after the Virginia State Veterinarian learned that a horse originating from the farm had tested positive for EHM and was quarantined in Maryland.  No other horses have been on or off the Virginia farm in the last month. There was no exposure to horses outside of the farm. 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.

September 24, 2018
Eastern Equine Encephalitis
Oneida County, WI
Confirmed Case(s): No Quarantine
Source: Wisconsin Department of Agriculture, Trade and Consumer Protection

The Wisconsin Department of Agriculture, Trade and Consumer Protection has confirmed its second case of Eastern Equine Encephalitis (EEE) for 2018 in Oneida County. The affected horse was a 15-year-old Belgian/Paint cross gelding from Oneida County tested positive with IgM Capture ELISA. He was incompletely vaccinated, having had his first ever EEE vaccine this spring without a booster. The gelding began showing neurologic signs on September 13, 2018, became recumbent and was euthanized on September 14th.

September 24, 2018
West Nile Virus
Poweshiek County, IA
Confirmed Case(s): No Quarantine
Source: Iowa State Veterinarian's Office

The Iowa State Veterinarian’s Office confirmed a case of equine West Nile virus (WNV) in Poweshiek County. An unvaccinated two-year-old Standardbred gelding showed an onset of clinical signs on September 17th, 2018 including ataxia and dragging one hind-leg. The horse was treated symptomatically and is recovering. WNV was confirmed at the Iowa State University Veterinary Diagnostic Laboratory.

September 24, 2018
Equine Infectious Anemia
Colorado, United States
Information Only
Source: Colorado State Veterinarian’s Office

The Colorado State Veterinarian’s Office at CDA has continued to work to trace horses involved in the EIA Incident in the State of Colorado. As of 09/24/2018: Only one horse has been confirmed positive horse in Colorado (index case). The index premises in Weld County is under a quarantine order; two associated premises are under hold orders. The 124 exposed horses under quarantine on the index premises tested negative for EIA last week; they will be re-tested on or after 10/19/2018 (sixty days after last exposure to the positive horse). 128 exposed horses have been located in Colorado. 54 premises are now under hold orders in 20 Colorado counties: Adams, Arapahoe, Boulder, Crowley, Delta, Douglas, Eagle, Elbert, El Paso, Fremont, Gilpin, Gunnison, Huerfano, Jefferson, Larimer, Mesa, Moffat, Montrose, Phillips, and Weld. 64 exposed horses have been positively identified in 10 other states: Arizona, Kentucky, Louisiana, Maine, Missouri, Nebraska, Nevada, Oklahoma, Texas, and Wyoming. Last week, two exposed horses that were re-tested on their final 60-day test were negative and those two Colorado premises were released from their Hold Order. Re-testing of Exposed Horses under Hold Orders: Some of the exposed horses will be eligible for their final 60-day EIA re-test over the next four weeks. CDA has informed owners and their veterinarians about the testing of exposed horses which can begin on the date stated on their Hold Orders. The date varies depending on the last date that the horse was exposed to the EIA-positive horse. At this time only the exposed horses need to be tested, not all of the horses on the premises under the Hold Order.

September 24, 2018
Rabies
Sussex County, DE
Confirmed Case(s): No Quarantine
Source: attending veterinarian and the Delaware Department of Agriculture

The attending veterinarian and the Delaware Department of Agriculture confirmed a case of rabies in Sussex County, Delaware. On September 16, 2018 an 8-mon-old unvaccinated mini donkey colt with neurologic signs. The donkey had a 2-day history of walking into fences, progressing to inability to rise in the hind and stupor. On 9/18/18 he was recumbent, paddling, and stuporous and was euthanized. For more information go to:  https://aaep.org/sites/default/files/Documents/Outside%20Linked%20Documents/DiseaseFactsheet-Rabies.pdf

September 24, 2018
West Nile Virus
Woodward County, OK
Confirmed Case(s): No Quarantine
Source: Oklahoma Department of Agriculture

The Oklahoma Department of Agriculture confirmed West Nile Virus (WNV) in Woodward County, Oklahoma. The 8-year old female had an unknown vaccination status.  A quarantine was not issued. This is a second case of WNV for 2018 in Oklahoma. For more information visit: http://www.ag.ok.gov

September 23, 2018
Equine Herpes Viruses
Frederick County, VA
Confirmed case(s): Official Quarantine
Source: Virginia Department of Agriculture

On September 21, 2018 the Virginia Department of Agriculture, confirmed a positive Equine Herpesvirus Myeloencephalopathy (EHM) in a Quarter Horse stallion at a small private farm in Frederick County, Virginia. The horse had not been off the farm in several months. There was no exposure to horses outside of the farm. The farm is under quarantine and temperatures of the resident horses are being monitored twice a day. Any horses that display clinical signs will be reported to the State Veterinarian and will be tested. For more information go to: https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHM.pdf

September 22, 2018
West Nile Virus
Trumbull, Wayne, Holmes, Tuscarawas, Coshocton, Ashtabula Counties, OH
Confirmed Case(s): No Quarantine
Source: Ohio Department of Agriculture

The Ohio Department of Agriculture has reported 14 additional cases of equine West Nile virus (WNV), bringing the total number of confirmed cases in 2018 to 31. A 2-year-old Hackney Pony gelding from Trumbull County began showing symptoms on September 5th 2018 including hypersensitivity, ataxia, and a fever. horse was not vaccinated against WNV. As of 09/06/2018 the horse was alive and recovering. A 13-year-old Standardbred gelding from Wayne County started showing clinical signs on 09/04/2018. owner began noticing an uncoordinated gait, ataxia and a droopy lip. horse was not vaccinated against WNV /2018 the horse was alive and recovering. A 3-year-old Standardbred mare from Holmes County started showing clinical signs on 09/04/2018 when the owner began noticing an uncoordinated gait, severe ataxia and a droopy lip. horse was not vaccinated against WNV. As of 09/18/2018 the horse was alive and slowly recovering. A 5-year-old Standardbred gelding from Tuscarawas County showed an onset of clinical sign son 9/10/2018 when the owner began noticing posterior paresis and ataxia. The horse was not vaccinated against WNV. As of 09/19/2018 the horse was alive and recovering. A 3-year-old Dutch Harness gelding from Tuscarawas County showed anorexia and posterior paresis. The horse was not vaccinated against WNV. As of 09/10/2018 the horse was alive and recovering. An 8-year-old Percheron mare from Holmes County showed an onset of clinical signs on 09/07/2018 including severe ataxia, severe muscle fasciculations and bilateral hind limb paresis. The horse was not vaccinated against WNV and was euthanized. A 3-year-old Belgian gelding from Coshocton County. Started showing ataxia on 09/08/2018. Symptoms progressed to muscle tremors, incoordination and proprioceptive deficits in all legs. The horse was not vaccinated against WNV. The horse was recovering as of 09/17/2018. A horse from Ashtabula County showed an onset of clinical signs on 09/03/2018 The owner first noticed that the horse had trouble standing. The veterinarian examined the horse and noticed it was ataxic, had proprioceptive deficits in all legs, facial muscle fasciculations, a heart rate of 36 and a fever of 101.6°. The horse was not vaccinated against WNV. The horse was recovering as of 09/17/2018. A 10-year-old Standardbred mare from Wayne County started showing symptoms on 09/11/2018 and was brought to the clinic because it was laterally recumbent, unable to rise, had minimal movement in the fore limbs, and progressed to a loss of function in the rear limbs. The horse was not vaccinated against WNV. The horse was euthanized on 09/15/2018. A 10-year-old Paint gelding from Tuscarawas County. The horse was ataxic all over, it was down but rose when the Veterinarian went to check on it. The horse was not vaccinated against WNV. The horse was euthanized. An adult Belgian gelding from Holmes County started showing signs on 09/08/2018. The veterinarian received a call for a horse walking in circles. Upon arrival the horse was unable to rise and would continuously fall. It had posterior paresis and was down later that day. The horse was not vaccinated against WNV. The horse is alive and recovering as of 09/19/2018. A 4-year-old Morgan gelding from Holmes County started showing clinical signs on 09/09/2018. The Veterinarian was called out for a wobbly horse, upon arrival they noticed that the horse was down. The horse was not vaccinated against WNV. The horse was euthanized. A 6-year-old Standardbred gelding from Wayne County started showing clinical signs on 09/04/2018 when the owner first noticed the horse had a droopy lip. Two days later the symptoms progressed to full body tremors and localized muscle fasciculations, front limb paresis, and was laterally recumbent. The horse was not vaccinated against WNV. The horse is alive and recovering as of 09/14/2018. A 7-year-old Mule Mollie from Tuscarawas County started showing clinical signs on 9/1/2018. The owner was trying to load the mule onto a trailer, the mule got off the trailer and was agitated and hypersensitive. The mule began running down the road, collapsed and died suddenly. The horse was not vaccinated against WNV. The horse is deceased. Serum samples from all horses were positive for WNV using IgM capture ELISA with titers of 1:400 or greater.

September 22, 2018
Equine Herpes Viruses
Montgomery County, MD
Confirmed case(s): Official Quarantine
Source: Maryland Department of Agriculture
  1. September 21, 2018, the Maryland Department of Agriculture, Animal Health Program confirmed a positive Equine Herpesvirus Myeloencephalopathy (EHM) in a 12-year old warmblood gelding in a Maryland horse. The neurological horse was seen earlier and treated as an outpatient on September 21st at a private veterinary clinic Loudoun County, Virginia before returning home to a private farm in Montgomery County, Maryland. A hold order placed on the farm the evening of September 21st. There are 18 horses on the farm in three barns. The positive gelding is isolated from all horses on the farm. The positive gelding was previously housed with 4 horses in one barn. The other two barns are more than 30 feet away from the exposed barn. Strict isolation and biosecurity protocols are in place at the exposed barn with body temperatures taken twice daily. With all three barns there will be no movement on or off the farm. The other two barns will be observed daily and adhering to strict biosecurity procedures. The attending veterinarians that administers to this farm will be notified of the hold order and apprised of the procedures taken to control the spread of EHV-1/EHM. Possible links to the positive gelding are actively being investigated.