Colorado Horse Tests Positive for Neurologic EHV-1

A horse that began showing signs consistent with equine herpes myeloencephalitis (the neurologic form of equine herpesvirus-1, or EHV-1) earlier this week has tested positive for the virus. The horse was euthanized.
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The Colorado State University Veterinary Diagnostic Laboratory has notified Colorado Department of Agriculture’s State Veterinarian’s Office that a horse which was showing signs consistent with equine herpes myeloencephalitis (the neurologic form of equine herpesvirus-1, or EHV-1) earlier this week has tested positive for EHV-1. The horse was euthanized due to complications with the virus.

A second horse that resided with the EHV-1 positive horse has developed a fever and is considered a suspect case but is not displaying any neurologic signs at this time. This second horse attended some of the same events within the rodeo/barrel racing circuit as the index horse.

Because of these developments and the recent history of other EHV-1 cases in other states, the Colorado State Veterinarian’s Office recommends that equine event organizers and horse owners competing in the rodeo/barrel racing circuit exercise extreme caution with regards to the planning and holding of equine events.

“Disease prevention practices and good biosecurity should be implemented,” said State Veterinarian Keith Roehr, DVM. “Owners should consider the risk for exposure to EHV-1 at upcoming events to be elevated and owners may want to consider keeping their horses at home to limit their individual risk

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