EHV-1 Confirmed in Michigan Standardbred Horse

The horse, who began showing neurologic signs of disease on Dec. 23, is recovering with veterinary care.
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A Standardbred racehorse residing in Genesee County, Mich., has tested positive for neurologic equine herpesvirus-1 (EHV-1), state veterinarian Steve Halstead, DVM, confirmed Jan 2.

Halstead told TheHorse.com that the affected horse participated in a race at Sports Creek Raceway, a haul-in only racetrack in Swartz Creek, Mich., on Dec. 22, 2012, and began showing neurologic signs of disease on Dec. 23, 2012. That day, the animal’s owner/trainer contacted their veterinarian, who took samples and sent them for evaluation at the state diagnostic lab, Halstead said. He was informed of the positive test results Dec. 28, shortly before 5:00 p.m., he said.

"(The horse’s condition) worsened through the first part of that week; in fact the veterinarian thought it was pretty much over on Wednesday (Dec. 26), but he since has recovered," Halstead said. "There’s one other horse in the same stable, but there’s no indication that it’s ill."

Halstead noted that both horses had previously received rhinopneumonitis vaccinations, "which is normal procedure for this veterinarian and this trainer. It wasn’t following infection, just a routine vaccination

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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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