EPM's Lesser Known Cause: N. hughesi
Equine protozoal myeloencephalitis (EPM) is a frequently diagnosed neurologic disease of horses in North America. Researchers point to the protozoan parasite Sarcocystis neurona as the most common cause, but they have identified another closely related protozoon, Neospora hughesi, in affected horses’ central nervous systems.

S. neurona’s life cycle has been well-characterized (see TheHorse.com/28383). The epidemiology of N. hughesi, on the other hand, is poorly understood, and reports of infection are sparse. N. h

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