Two new cases of equine herpesvirus have been confirmed at an Orange County facility in California, bringing the total of affected animals in that barn to five. Testing on the horses confirmed them as positive for the neuropathic strain of EHV-1 on Jan. 13, after the animals presented signs of fever, according to a statement by the California Department of Food and Agriculture.
Although the outbreak of equine herpes virus cases in the western half of the country have slowed, another horse tested positive in Washington, and one in Alberta has also been confirmed.
A horse admitted for colic was found positive for EHV-1 at the Washington State University College of Veterinary Medicine’s teaching hospital in Pullman, Wash. This was only two days after the equine treatment facility re-opened following a thorough cleaning and sanitation process to eliminate remnants of the virus.
Two more horses in Arizona and one in Montana have tested positive for equine herpes virus (EHV-1).
One of the horses in Arizona has not only tested positive for the virus, but also for the more deadly neurological variant, equine herpes virus myeloencephalopathy. Local veterinarians are not releasing the locations of these cases, according to The Herald.
The latest situation report released by the U.S. Department of Agriculture indicated that the rate of confirmed cases of equine herpes virus myeloencephalopathy, the neurological form of equine herpes virus (EHV-1), is slowing.
More than 13,000 horses reside in Sonoma County, Calif., making the equine industry there second only to its world-famous wine. But the Sonoma horse community is far from a united front against the outbreak of equine herpes virus (EHV-1).
Reactions run the gamut with few people sitting on the fence.
Two Sonoma County horses attended the National Cutting Horse Association Western National Championship, held April 28-May 8 in Ogden, Utah, which has been pinpointed as the source of the potentially lethal virus. These two horses haven’t yet shown symptoms of the disease.
An outbreak of equine herpes virus myeloencephalopathy, the neurological form of equine herpes virus (EHV-1), has been reported in eight western U.S. states, prompting the cancellation of 19 U.S. Equestrian Federation competitions.
On May 17, the organizing committee of the Spring Gulch Horse Trials announced the cancellation of the event, to be held May 21-22 in Littleton, Colo., due to the recent outbreak of equine herpes virus in surrounding areas.
The New Jersey Department of Agriculture announced the quarantine of a second New Jersey farm on April 15 after an outbreak of equine herpes virus type 1 in the Colts Neck area.
The first case of EHV-1 was discovered at Overbrook Farm where a veterinarian was treating a sick filly. The horse was euthanized on April 13 after she didn’t respond to treatment. Five other horses at the same location were also infected but are recovering.
A second horse was diagnosed with equine herpes virus-type 1 on March 30 after being released from the Cornell University Equine Hospital in Ithaca, N.Y. The gelding was released March 22 and started showing signs of neurological distress after arriving at his home farm. He is now recovering.
The first horse with a confirmed case of EHV-1 died at Cornell Equine Hospital on March 20. Sixty-nine horses at Cornell were potentially exposed to the virus, and the hospital is now under voluntary quarantine.