Farm Talk

Equine

May 13, 2014

K-State vet says EHM occurrence is a reminder to take precautions

Parsons, Kansas — It's springtime and for many horse enthusiasts, that means heading out to horse shows and rodeos. But two recent cases of Equine Herpesvirus Myeloencephalopathy, after a barrel racing event in Nebraska should serve as a reminder that good biosecurity practices can help prevent illnesses, according to a Kansas State University veterinarian.

Beth Davis, a professor of clinical sciences in K-State's College of Veterinary Medicine referred to two cases of EHM that were diagnosed after a large barrel racing event held recently in Lincoln, Nebraska. One of the horses, from a farm in north-east Kansas, became ill after its return to Kansas, according to the Kansas Department of Agriculture. It was euthanized and samples tested by the Kansas State Veterinary Diagnostic Laboratory and Equine Diagnostics Services in Lexington, Kentucky confirmed EHM. The other confirmed case was a horse from Wisconsin that also was present at the Nebraska event.

"EHM can be highly contagious," said Davis of the neurologic disease associated with equine herpesvirus infections. "If we're not careful, this virus can spread and can be life threatening."

The virus that causes EHM is called EHV-1. EHV-1 is common and can be present in a horse for years, causing a minor illness when first contracted and in most cases never develops into EHM. Most commonly EHV-1 causes mild to moderate respiratory disease, abortion in pregnant broodmares, illness in young foals. Fortunately, only rarely EHV-1 actually causes EHM. In some cases and especially in times of stress, however, the virus can be reactivated and shed to others. Stressful situations such as strenuous exercise, long-distance transport or weaning can be the trigger for viral shedding.

"What determines whether a horse gets sick is its immune system," Davis said. "If a horse's immune system is not strong and the animal is under stress, EHV-1 can develop into EHM. We usually see this after horses have been in a large group, such as at horse shows, rodeos or race tracks."

Symptoms usually start with a fever. The illness may progress and show signs of weakness and a lack of coordination. Urine dribbling and lethargy may also signal the disease, and sometimes the illness progresses to a horse going down, Davis said. In the worst cases where the animal can't rise, also called recumbency, they can die or are so ill that they will be euthanized.

She provided tips and facts for horse owners.

EHM is easily spread by direct horse-to-horse contact. It can also be spread by contact with contaminated objects such as tack, grooming equipment, feed and water buckets, and people's hands and clothing.

Contact your veterinarian if your horse's temperature is 101.5 degrees Fahrenheit or higher. A normal, healthy temperature for a horse is 100 degrees.

Currently, there are vaccines available to boost a horse's immunity. They're labeled to fight respiratory disease and abortion, but they're not labeled for the prevention of EHM. Work with your veterinarian to select an ideal vaccine program.

Some horses recover from EHM but not without treatment. In some cases, even treated horses can die.

People cannot get sick from EHV-1, which causes EHM so there is no threat to humans. It is most commonly an equine disease, although it can occur in camelids, such as llamas and alpacas.

Davis said she is not recommending that horse owners stay home from competitions, based on the two recent cases.

"Personally, I think if we were going to have a major outbreak, we probably would have seen more cases by now. We had two from the barrel racing event but we're more than two weeks out from that and no other cases have been reported at this point," she said.

Davis said she and K-State veterinarian Laurie Beard are available to answer questions and concerns Kansas horse owners may have. They can be reached at 785-532-5700.

More information about EHM and EHV-1 and keeping horses healthy is also available at http://www. aphis. usda.gov/vs/nahss/ equine/ehv/equine_her pesvirus_brochure_2009.pdf and  http://agriculture.ks. gov/news-events/news-re leases/2014/04/29/ehv-1-case-confirmed-in-kansas.

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