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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.


May 09, 2018
Equine Herpes Viruses
Montgomery County, TX
Confirmed case(s): Official Quarantine
Source: Texas Animal Health Commission

The Texas Animal Health Commission (TAHC) confirmed Equine Herpes Myeloencephalopathy (EHM) in a Montgomery County barrel racing horse on May 9, 2018. The horse showed signs of ataxia and other neurologic signs consistent with EHM when evaluated by a veterinarian. The premises is under movement restrictions and TAHC staff is working closely with the owner and veterinarian to monitor potentially exposed horses and implement biosecurity measures.Prior to confirmation, the positive horse attended barrel racing events at the Oklahoma City Fair Grounds on April 28-30 and Williamson County Expo Center in Taylor, Texas on May 5. TAHC staff has been in contact with event management and veterinarians to ensure enhanced biosecurity measures are taken on the premises and event participants are notified.

May 08, 2018
Equine Herpes Viruses
Weld County, CO
Quarantine Released
Source: Colorado State Veterinarian’s Office

The Colorado Department of Agriculture’s State Veterinarian’s Office has released the quarantine associated with an Equine Herpesvirus (EHV-1) case in Weld County. Only one horse tested positive for the virus during the investigation. Horse owners are encouraged to maintain disease prevention practices to help keep their equine herd healthy.

May 03, 2018
Equine Herpes Viruses
Brookings, SD
Confirmed Case(s): Voluntary Quarantine
Source: South Dakota State Veterinarian

The South Dakota State Veterinarian has confirmed a case of equine herpesvirus myeloencephalopathy in a 19 year old QH mare with neurologic illness. The horse belongs to a college rodeo participant and has extensive recent travel history to rodeos within the Great Plains Region. The horse has been isolated and voluntarily quarantined in Brookings, SD, upon returning from an event in Hastings, NE, the weekend of April 27-28, 2018. Owners of horses known to be directly exposed to the index horse are advised to restrict movement and monitor their horses for signs of illness, including twice daily temperature monitoring.

 

May 03, 2018
Equine Herpes Viruses
Carbon County, WY
Confirmed case(s): Official Quarantine
Source: Wyoming Livestock Board

On 4/27/18 the Wyoming Livestock Board received negative laboratory results for Equine Herpesvirus (EHV-1) in a blood sample from a horse in Carbon County. The horse had been showing hind limb neurologic symptoms. Nasal swabs had not been taken. Still concerned about EHM, the owners were advised to impose a self-quarantine and closely monitor all horses for EHM symptoms including temping two times daily. The veterinary clinic was advised to maintain isolation and resubmit both blood and nasal samples. On 5/2/18 the results on nasal swab were reported as positive for EHV-1 wild type. The premises was placed under quarantine with continued close monitoring on all 16 horses.The affected horse had attended high school rodeos at Laramie on April 7th and 8th, 2018 and Rock Springs on April 14th and 15th, 2018. Any horses at either of these events potentially could have been exposed as well and should be monitored closely preferably taking temperatures twice daily. Any horses with fevers (101.5 or higher) or showing respiratory or neurologic symptoms should be isolated immediately and their veterinarians consulted as to ongoing management. One horse from this premises NOT showing any signs of infection or disease attended the high school rodeo at Big Piney. While risk is minimal, horses at that event should be monitored as well.

May 02, 2018
Equine Herpes Viruses
King County, WA
Quarantine Released
Source: Washington State Department of Agriculture

As of May 2nd 2018, the Washington State Department of Agriculture has released all 3 quarantines associated with the EHM horse in King County. At this time, the State of Washington has no more quarantines relating to the EHV 1 virus.

May 01, 2018
Equine Infectious Anemia
Clearwater County, AB
Confirmed case(s): Official Quarantine
Source: Canadian Food Inspection Agency

On April 27, 2018, the Canadian Food Inspection Agency confirmed a case of Equine Infectious Anemia in Clearwater County, Alberta. The horse had been sampled by an accredited veterinarian to comply with an organized club’s requirements. No clinical signs of disease were noted at the time of sampling. A CFIA investigation is underway and as per program policy, a quarantine has been placed on the infected animal and its on-premises contact animals. The quarantine will remain until all disease response activities have been completed, including follow-up testing and ordering the destruction of positive cases. Trace-out activities may require the CFIA to undertake actions at additional premises as outlined in the current program policy.

April 30, 2018
Equine Herpes Viruses
Orange County, CA
Outbreak Update
Source: California Department of Food and Agriculture

On April 29, 2018 The California Department of Food and Agriculture confirmed a new case of Equine Herpesvirus Myeloencephalopathy (EHM). A 9 year old mare from the quarantined barn at the Orange County Facility, displaying neurological signs has tested positive for Equine Herpesvirus-1. Based on clinical signs and the detection of the EHV-1 virus, the horse has been classified as a case of Equine Herpesvirus Myeloencephalopathy. This mare has been placed in onsite isolation stabling. To date, there have been seven (7) confirmed febrile cases of EHV-1 and three confirmed cases of EHM. CDFA continues onsite monitoring of the situation.

April 27, 2018
Equine Herpes Viruses
Orange County, CA
Outbreak Update
Source: California Department of Food and Agriculture

April 26, 2018 the California Department of Food and Agriculture confirmed Equine Herpesvirus (EHV-1) intwo horses, that had fevers and are from the previously quarantined barn at the Orange County Facility. The first positive horse displayed a fever on 4/23/2018 and was placed in onsite isolation stabling. The second positive horse that initially tested negative over the weekend was moved off site for isolation and quarantine. Enhanced biosecurity measures and twice daily temperature recording for all exposed horses in the quarantine barn continues. To date, there have been seven confirmed febrile cases of EHV-1 and the one index case of Equine Herpesvirus Myeloencephalopathy (EHM). Release of positive horses from quarantine isolation requires two negative tests seven days apart. CDFA staff continues onsite monitoring of the situation.

 

April 26, 2018
Equine Herpes Viruses
Laramie County, WY
Confirmed case(s): Official Quarantine
Source: Wyoming Livestock Board

On April 12, 2018 the Wyoming Livestock Board barrel racing horse in Laramie County suspected of having rabies was admitted to CSU Veterinary hospital with progressive neurologic disease effecting both hind and front limbs as well as the cranial nerves. The horse was recumbent and euthanized for humane reasons. Testing for rabies was negative on the 4/13/2018h. The horse owner was contacted and because EHM had not yet been ruled in or out, they were advised to impose a self-quarantine and implement enhanced monitoring of each horse on the premises to include at least twice daily recording of rectal temperatures with any suspect cases reported immediately. On Monday 4/23/2018, CSU reported to the WLSB that brain tissue was suspect on PCR for EHV-1 wild type and that histopathology of the spinal cord was consistent with EHM.   On Tuesday 4/24/2018, CSU reported to the WLSB that nasal swabs that had been collected on admission and held were test positive on PCR for EHV-1 wild type. This confirmed EHM and allowed an official quarantine to be placed on the premises which had already been meeting the conditions of such on a voluntary basis since the 4/12/2018. With no further cases being suspected during the 14 days from last exposure and diligent monitoring, the quarantine was released on 4/26/2018. The WLSB has been working closely with the Colorado Department of  Agriculture on this and other cases and the source of this infection is currently unknown.

April 25, 2018
Eastern Equine Encephalitis
Levy County, FL
Confirmed Case(s): No Quarantine
Source: Florida Department of Agriculture and Consumer Affairs

On April 25th, 2018 the Florida Department of Agriculture and Consumer Services received confirmation of one horse in Levy County who tested positive for Eastern Equine Encephalitis (EEE). The two-year-old mini mule became clinical on April 17 and was humanely euthanized on April 18 due to a poor prognosis. There is no known vaccination history.