Traverse City Record-Eagle

Archive: Friday

July 5, 2013

Rare horse disease appears on Old Mission Peninsula

TRAVERSE CITY — About a month ago, Nancy Reye was horseback riding and noticed the rear of her horse seemed weak.

I couldn’t get her going; she felt weak underneath me,” she said. “I thought it was a hoof, a joint, but nothing was showing up. Then I rode her one night and she could hardly balance me. It was almost kind of scary.”

Reye guessed her horse, Ellie, was suffering from equine protozoal myeloencephalitis, or EPM, a serious and often fatal neurological disease. That’s because her horse had shared a barn on Old Mission Peninsula with two other horses previously diagnosed with EPM after they’d become weak and stumbled on rides. Ellie also tested positive.

Reye later learned that it’s highly unusual for three out of six horses to be struck with EPM within a year of each other.

“It’s weird because it’s supposed to be very sporadic,” Reye said.

Indeed, the protozoal parasite causing EPM can be detected in a majority of horses. But only about 1 percent of horses that test positive for the parasite ever develop a clinical disease, said Shanti Bhuyan, a large animal veterinarian in Kingsley, who cited a large study.

Bhuyan called the 50 percent occurrence in one barn a “statistical glitch.” He sees 2,000 horses a year, and hasn’t seen a single case.

“I just want to make it clear that there is not an outbreak. There is no cause for alarm,” said Bhuyan.

Bhuyan wondered if the horses had poor immune systems, but Reye said two were in excellent health and relatively young, while the third horse was a rescue and in poor health.

The parasite is not contagious, but is spread by opossums when they defecate in the horse’s water, feed or hay. Opossums pick up the parasite from cats, raccoons, skunks, and other mammals. The parasite cannot be spread from one horse to another.

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