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Alberta Horse Trials Association

Supporting and Promoting Eventing in Alberta

ANNOUNCEMENTS

Neurotropic Equine Herpes Virus-1 (nEHV-1)

This virus affects the neurological functions of the horse, something like wobbles. Untreated can be serious and potentially deadly.
Indications are nasal discharge, lots of sneezing, excessive eye blinking, lack of urine output, elevated temp and very weak coordination in the backend.
Blood work with a low temp may still result in a negative reading, indicating nothing wrong; The most effective diagnosis is to do a PCR test

Bottom line is that effective biosecurity is the key to keep this from spreading. There currently is no vaccine that protects well for this type of herpes. Not surprising, as it is a latent virus that most horses carry in their systems from a young age.
In humans, the latent forms of herpes cause cold sores and shingles, there is no effective vaccine for us either.

Please read the following brochure for more information and contact your veterinarian should you have any concerns or questions.     equine_herpesvirus_brochure_2009.pdf (3.2mb)

Equine Canada News Release - June 3, 2011                

June 3, 2011 — Equine Canada’s Health and Welfare Committee is sharing the following status update on Neurotropic Equine Herpes Virus-1 (nEHV-1) received today from Alberta and Western Canada. This information comes as a result of consultations among the Chief Provincial Veterinarian for Alberta, members of the Alberta Veterinary Medical Association, faculty members, University of Calgary Veterinary Medicine, local Albertan equine practitioners, in addition to veterinarians from British Columbia and Saskatchewan.


To date the reported positive cases of nEHV-1 in Alberta are as follows:

  • One neurological case (now recovered) first found positive at the start of May
  • Three cases positive with mild respiratory signs/fever are all now recovered
  • Four PCR positive horses, showing no clinical signs
  • One new neurological case ,responding well to treatment, that attended cutting events in Alberta
  • One of the previously ‘suspect’ neurological cases in Northern Alberta that was at the cutting competition in Lloydminster (reported in last update).

To date suspect cases of nEHV-1 in Alberta are as follows:

  • One previously reported neurologic case. The mild neurological signs are almost resolved and the horse remains under quarantine. To date testing has been negative.
  • The second suspect with mild neurological signs in Northern Alberta that was at the cutting competition in Lloydminster (reported in last update) still remains in the suspect list.
  • New neurological suspect case from Central Alberta was euthanized due in part to complications with previous significant medical conditions. Testing is pending.
  • New neurological suspect case with mild fever from Central Alberta. Testing is pending.

The update in Saskatchewan, from the Prairie Diagnostic Services laboratory, indicated a single confirmed case that was present at the Lloydminster competition. Previously reported cases in February 2011, from this laboratory, are not considered part of the current EHV-1 outbreak.

The update in British Columbia, from the Animal Health Centre laboratory (Ministry of Agriculture), indicated two positive nEHV-1 cases confirmed through the laboratory. These cases had either direct or indirect contact with horses that were at the Ogden, Utah competition.

To date, all of the cases and suspected cases appear to remain in horses associated with the cutting horse industry.

All other disciplines outside of the cutting industry continue at this time to be considered low risk. The decision to cancel competitions and shows in other disciplines should be made in partnership with their associated veterinarian to develop a risk assessment of each situation.   Excellent resources on biosecurity protocols for the equine community can be found on the Alberta Veterinary Medical Association website, and the equestrian federation websites of Alberta and Saskatchewan.  

The following is an earlier statement from the Canadian Food Inspection Agency (CFIA):

Equine Herpes Virus (EHV) is a disease present in Canada and is not a federally controlled disease. Subsequently, in accordance with international guidelines, CFIA has no authority for requesting certification related to this disease from the United States Department of Agriculture when importing horses from the United States (US). Import conditions for all horses entering Canada from the US will not be changed in relation to the recent reports of EHV cases in the US. However, as always, imported horses need to comply with all current Canadian import conditions. In addition, arrival of unwell horses at the border can affect the import process.

Equine Canada is working with the offices of Canada’s chief veterinarians to monitor the situation and keep our members abreast of developments. We will post new information and status updates regarding EHV-1 neurological cases on our website at www.equinecanada.ca.  

Outbreak control of nEHV-1 is dependent on proper biosecurity or containment strategies.  Equine Canada strongly urges owners to consult the following resources to better understand the nature and control of this infectious disease:

Owners are encouraged to speak with their veterinarian if they have additional concerns or questions.  

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New 2011 Equine Canada Eventing Dressage Tests can be found here . . .

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