Know the Signs of EPM, a Master of Disguise
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Equine protozoal myeloencephalitis (EPM) is a debilitating neurologic disease that cannot be ignored. More than half of all horses in the United States—and in some areas as many as 90%—have been exposed to the disease’s causative agents. Its ability to masquerade as other health issues, such as lameness or other neurologic diseases, can make it difficult to diagnose.
While Sarah Reuss, VMD, Dip. ACVIM, of Merial Veterinary Services, says some horses exposed to EPM’s causative agents will not develop the clinical disease, horses under stress are more likely to show signs. In some cases, horses can even be infected without showing signs for months or years or ever. When horses do show signs, it can go misdiagnosed because it can slowly progress and infect any portion of the central neurologic system, mimicking other conditions.
Left untreated, EPM can lead to permanent damage
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