Equine protozoal myeloencephalitis, better known to horse owners as EPM, is caused by a protozoal infection that affects horses’ central nervous system. Experts say that early identification is key to the successful treatment of this debilitating disease, most horses with mild symptoms recover fully if they are treated in time. Dr. Maureen Long, an infectious disease and equine medicine specialist, discusses what horse owners need to look for in their animals in order to recognize the signs of illness and seek veterinary care. She also will discuss the difficulties in diagnosis and progress made in treatment and what scientists know about the parasite, itself.