Another Horse Stabled in Maryland Positive for EHV
by The Associated Press
Date Posted: 1/24/2006 5:21:04 PM
Last Updated: 1/24/2006 5:45:53 PM
A horse at Laurel Park has tested positive for the equine herpesvirus that has already claimed two horses at nearby Pimlico Race Course and prompted a state quarantine at the home of the Preakness Stakes (gr. I).
However, the Laurel horse has not shown any symptoms of the disease and it is not clear whether the horse is contagious, or merely has been exposed to the virus in the past like many other horses, said Guy Hohenhaus, state veterinarian for the Maryland Department of Agriculture.
The horse, an outrider used in training race horses, has been brought to Pimlico for isolation and further testing. The tests will most likely be in the form of nasal swabs that will be cultured to see if the virus is present in the respiratory tract as well as in the bloodstream.
If the swabs test positive, “then that horse probably needs to be restricted until it tests negative,” Hohenhaus said.
The disease, which does not affect humans, can cause upper respiratory infections in horses as well as neurological symptoms that may affect the ability to walk and run. At least 11 horses at Pimlico have shown signs of the virus this month and two horses have been euthanized.
Isolation at Pimlico is expected to continue at least until the middle of next month. Hohenhaus said state animal officials are looking for a three-week disease free period before they are comfortable that the outbreak has passed.
“We’re looking for an exit, at what point in time do we declare this over,” Hohenhaus said.
The first barn could be released from the quarantine order as early as next week and “the earliest we could be out of this is mid-February,” the state veterinarian said.
The Pimlico racing season begins in mid-April and includes the Preakness, the second leg of the Triple Crown, in May. The racing secretary for the Maryland Jockey Club, Georganne Hale, said the virus might affect racing dates.
Horses that race at Laurel are drawn from a pool of about 2,000 horses statewide, including about 500 at Pimlico, as well as horses from other states. The Pimlico horses are now unavailable to race at Laurel and some states are not allowing horses to travel to Maryland, limiting the number of horses available to race at Laurel.
David Zipf, a veterinarian for the Maryland Racing Commission, said the virus is normally not very contagious, but the strain or strains that have hit Pimlico appear to be more easily spread and more virulent.
One horse that tested positive at Pimlico, for example, was in a barn at the opposite end of the race course from the others.
“We can’t explain that and this is what makes it a scary situation,” Zipf said.
Why the outbreaks are occurring now is still a mystery, Hohenhaus said.
“There’s no smoking gun or leading theory coming out about what might have triggered this,” Hohenhaus said.
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