The following information is provided as a public service for horse owners and horsecare professionals.
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| The world-famous horseshoeing school and farrier shop at  Cornell vet school is remaining open during the quarantine, according to  resident farrier Steve Kraus. The shoes in the display case are part of the university's extensive collection of shoes made by Professor Henry Asmus, founder of Cornell's shoeing school in 1913; it was the first in the United States. (Flickr.com photo by Michael King)
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The New  York State Department of Agriculture and Markets’ animal  health  officials and veterinarians from the Equine Hospital at Cornell   University are investigating two confirmed cases of Equine Herpesvirus 1   (EHV-1) in New York State.  Both horses listed as cases of EHV-1 were  inpatients of the  Equine Hospital at Cornell University, and could have  potentially  exposed 69 other horses.
EHV-1 is a  common viral infection of horses  that is highly contagious and exhibits  an array of symptoms, ranging  from no clinical signs to neurological  disorders.
New  York State Veterinarian Dr. David Smith said, “While a common virus in  horses, we are taking this situation very seriously given the large  number of horses that have potentially been exposed to a highly  communicable and sometimes fatal disease.  To date, no other horses have  showed signs, nor tested positive for the virus.  However, this serves  as an excellent reminder to horse owners that they should always be  cautious of introducing new horses with an unknown disease status.”
“We  recognize the seriousness of the Equine Herpesvirus Type 1 and other  infectious diseases,” said Dr. Alfonso Torres, Associate Dean of Public  Policy at the New York State College of Veterinary Medicine at Cornell  University. “Thanks to our surveillance systems and access to highly  sensitive testing at the New York State Veterinary Diagnostic  Laboratory, we were able to rapidly identify the infectious agent and  implement appropriate actions immediately to prevent the spread of the  infection.”
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| A quiet barn aisle at Cornell University College of Veterinary  Medicine Equine Hospital, photo by Ernest Fox courtesy of Flickr.com | 
This  incident involves two confirmed cases of EHV-1 in New York State.  One  was a one-day old foal that was admitted to the Equine Hospital on March  18.  The foal died two days later of pneumonia, and tests revealed the  presence of EHV-1 on March 25.
During the same time, a gelding was  being treated at the hospital for a spinal injury.  It was discharged on  March 22, but became severely ill and showed neurological symptoms  after arriving back at its home farm.  This horse tested positive for  EHV-1 on March 30.  The gelding is now recovering.
In  response to the two confirmed cases, both the gelding’s farm and the  Equine Hospital were quarantined immediately, restricting movement and  access to animals at both facilities.  Horses at both facilities are  being monitored closely and having their temperatures taken twice daily.  So far, no animals have exhibited a fever attributable to EHV-1, which  would be an early warning of the virus.
At the hospital, polymerase chain reaction (PCR) tests have  also been completed for four consecutive days on all current patients.  The PCR samples from all animals in the hospital are negative,  indicating that no virus shedding is occurring.
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| The Equine Hospital is located in Cornell's extensive new complex of  animal clinics on the edge of the Ithaca, New York campus. Photo by Ernest Fox,  courtesy of flickr.com | 
 
As  part of this on-going investigation, the Department of Agriculture and Markets is working to  determine the source of the infection, as well as to identify and  isolate potentially exposed horses.  In doing so, Cornell has been  contacting all referring veterinarians and the owners of 69 other equine  patients that may have been exposed while at the Equine Hospital.  The  Department is also communicating with private veterinarians to provide  information related to this situation, and is prepared to follow up on  possible quarantines of trace-out barns of the 69 potentially exposed  horses, if necessary.
At this time, neither the Department nor Cornell  know of any other animals that have showed signs or tested positive for  EHV-1 in association with this incident.
Nearly  all horses in their lifetime will be exposed to EHV-1 at some point,  and therefore it is difficult to detect as it takes on a wide range of  manifestations, from a complete lack of clinical symptoms, to pneumonia,  to abortion in mares, to full-blown fatal neurologic cases.  The virus  does not persist in the environment and is neutralized by hand soap,  alcohol-based hand sanitizers, and sunlight.  Transmission of the virus  is mostly via direct contact with infected materials.
EHV-1 does not  affect humans or dogs, cats, cattle, sheep, goats, pigs or birds; however, alpacas and llamas can be affected.
If  you are the owner or caretaker of a horse that was or has been at the Equine  Hospital at Cornell on or after March 18, 2011 or that may have come in  contact with a potentially exposed patient, the following guidelines are  recommended:
- Isolate  your animal, if possible.  It is always recommended that horses  returning from veterinary hospitals be isolated for three weeks when  possible.
- Check  your horse’s temperature twice a day for ten days.  If the temperature  is 102 degrees Fahrenheit or greater, contact your veterinarian  immediately.
- If  you care to test your horse, consult your veterinarian.  At this time,  the preferred test is PCR analysis performed on nasal swab specimens.
Since March  30, 2011, the Equine Hospital at Cornell University has been  quarantined.  No movement of animals between the equine barns and other  Cornell facilities is permitted at this time, and the hospital is  only accepting emergency cases.
Out of an abundance of caution, the  quarantine at the hospital will remain in effect through April 11.
For more information on EHV-1, visit the 
American Association of Equine Practitioners website or check 
USDA APHIS brochure on the virus.
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