EHV-1 in Ontario: Two Cases Confirmed

An affected gelding at a facility with both competition and resident horses in the Regional Municipality of York was euthanized after developing severe neurologic signs. The second horse, which had been stabled at the Municipality of York facility prior to returning to the District of Cochrane, also tested positive.
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ehv-1 in ontario
In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected. | Photo: Alexandra Beckstett/The Horse

The Equine Disease Communication Center (EDCC) reported April 10 that two horses in Ontario, Canada, have tested positive for equine herpesvirus-1 (EHV-1).

“On April 2, the Ontario Ministry of Agriculture, Food and Rural Affairs was notified of a confirmed case of equine herpes myeloencephalopathy (EHM, the neurologic form of EHV-1) … at a facility with both competition and resident horses in the Regional Municipality of York,” the EDCC said. “An unvaccinated senior gelding was euthanized after developing sudden and severe neurological signs.”

Subsequently, the EDCC reported, “a second horse, which had been stabled at the same facility in the Municipality of York for a short period of time prior to returning to the District of Cochrane … developed intermittent fevers and has also tested positive for EHV-1.” The second horse is recovering

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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