Neurologic EHV-1 Cases in Minnesota and Virginia

Two additional horses in the United States have been identified with equine herpesvirus myeloencephalopathy.

The American Quarter Horse Journal

Prior Lake, Minnesota
Via the Minnesota Board of Animal Health,
February 13, 2015

A horse with equine herpesvirus myeloencephalopathy, or the neurologic form of equine herpesvirus type-1, has been identified in Scott County, Minnesota.

The horse was stabled at Dark Horse Farm, 4300 182nd Street East, Prior Lake, MN 55312. The horse became ill Friday, February 6. It exhibited neurological signs, including ataxia and urinary incontinence (inability to control urination). It was then moved to Cleary Lake Veterinary Clinic in Prior Lake where it was held in isolation for treatment until test results were completed. Infection with equine herpesvirus type-1 was subsequently confirmed by polymerase chain reaction tests performed at Cornell University. The horse was euthanized Thursday, February 12.

The MBAH has placed a quarantine on the other horses at the stable. These horses will not be allowed to leave the stable for at least 21 days and will be monitored closely for fever or symptom of illness consistent with EHV-1.

Increasing biosecurity measures and vaccinating your horses are two easy ways to prevent EHV-1 in your horse herd. Heed this advice from The American Quarter Horse Journal to ensure you are taking the appropriate precautions to protect your horses.

Loudoun County, Virginia
Via the Virginia Department of Agriculture and Consumer Services,
February 13, 2015

On Thursday, February 12, 2015, the Virginia Department of Agriculture and Consumer Services was notified of a horse in Loudoun County that tested positive for equine herpesvirus myeloencephalopathy, a neurological disease of horses caused by equine herpesvirus type-1.

On February 5, that horse exhibited a fever and was not eating or drinking. Even though it never showed neurological signs, the owner took the horse to the Marion duPont Scott Equine Medical Center in Leesburg. There they tested for and quickly diagnosed EHV-1. The horse is under quarantine there and is recovering. A second horse from the same farm exhibited a fever but no other signs. As a precaution, it is also under quarantine at the EMC and VDACS is running tests at its Regional Animal Health Laboratory in Warrenton.

Dr. Richard Wilkes, State Veterinarian with VDACS, stressed that the horses were admitted directly into the isolation area at Marion duPont Scott. At no time were these horses in the general hospital area. The EMC is confident that their bio-security protocols will contain the virus to the isolation area.

Thirty-three other horses from the same farm are under quarantine on the farm premises in Loudoun County. None of them have shown any signs of EHV-1, but will be monitored at least through February 26. No horses from this farm have been at events during the incubation period for the virus.

VDACS began an epidemiological investigation on February 13 and will continue to monitor the situation. The Department will provide regular updates on its website and on Facebook and Twitter.

On February 5, VDACS reported a positive result for EHM in a horse displaying neurologic signs in western Albemarle County, Virginia, northwest of Charlottesville. By February 9, VDACS released a new report on the case in Albemarle County. Continue reading that release.