Horse Treated at OSU Tests Negative for EHV-1

The horse was isolated, treated for EHV-4, and was expected to be discharged Aug. 5.
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A horse that was treated at Oregon State University’s Lois Bates Acheson Veterinary Teaching Hospital for equine herpesvirus (EHV) type 4 is improving and was expected to be discharged on Aug. 5. The horse tested negative for all forms of EHV-1, including the neurologic strain.

Upon arrival at the hospital, the horse was immediately sent to the isolation facility due to nasal discharge and no other horses were exposed, officials say. The horse was tested and retested with diagnosis of EHV-4, a common viral respiratory agent for which most horses are vaccinated, and which does not cause neurologic disease. The vaccine for this virus is very effective.

“This case was well managed from beginning to end and should not pose any concerns to other horse owners,” said Keith Poulsen, DVM, PhD, Dipl. ACVIM, an internal medicine specialist at the hospital. “Our hospital is open for business as usual.”

The virus does not last long in the environment and is not known to have any harmful impact on humans. It’s often transmitted by nasal discharges from the horse. In the horse, EHV-4 typically is a mild, self-limiting disease

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