EHV-1 Update

Equine Herpesvirus-1 (EHV-1) Update May 20, 2011: Texas Animal Health Commission (TAHC) officials are continuing to trace exposed horses that attended the National Cutting Horse Association (NCHA) Western National Championships event that ended on May 8 in Ogden, Utah that were potentially exposed to Equine Herpesvirus-1( EHV-1). There are now 25 known horses in Texas that attended the event and 336 more cohorts (stablemates) of the 25 that are currently being held under movement restrictions across the state. The good news is that no new cases have been reported today. Texas still only has one confirmed case and one suspect case reported. The epidemiological investigation continues however, and Texas horse owners must be vigilant of the possibility that exposed horses may still be incubating the disease.
TAHC continues to suggests that horse owners closely evaluate the risk of participating in upcoming events scheduled for this weekend and/or co-mingling their horses with other horses and equipment (trailers) of unknown history. Because the incubation period is usually about 4-6 days or less, even a one week voluntary stop movement may be enough to nip the cycle of transmission between horses before it grows in scope. The TAHC will re-evaluate this position after analyzing new case data or other epidemiological information that may be disclosed over the weekend.
Horse owners should contact event organizers in advance to ensure that scheduled events have not been cancelled. Some other states have established emergency rules for entry as a result of this situation, so if interstate travel is planned, owners and/or veterinarians writing health certificates should check in advance to ensure they meet all entry requirements. Finally, it is recommended that all newly purchased horses or introduced horses to a premise should be isolated to help.
Equine Herpesvirus Useful Links:
  • Nationwide Equine Herpesvirus (EHV-1) Investigation Underway
  • Equine Herpesvirus Awareness
  • USDA EHV-1 Info Sheet
  • National Animal Health Monitoring System (NAHMS) 2008 Report on EHV-1
  • EHV-1 Definitions & Clinical Information
  • USDA Guide To Understanding the Neurologic Form of EHV Infection
  • EHV-1 Biosecurity Guidelines
  • Colorado News Release
  • New Mexico News Release
  • Idaho News Release
  • Utah News Release
  • Washington News Release
  • California News Release
  • Arizona News Release
  • Oregon News Release
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As of February 2011, all veterinarians must reapply to remain accredited by the USDA. This impacts the ability of veterinarians to perform a variety of activities important to animal health in Texas.
For questions, please contact Lynette Victor at USDA in Austin, TX at 512-383-2413.
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Budget & Appropriations Documents
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Rider Links & Pages of Interest To The TAHC
HB1 Recommendation (Pages V10-13 Reference TAHC)
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