What parasite causes Equine Protozal Myeloncephalitis?

Answer 1

Opossums are the definitive host for Sarcocystis neurona, which is the parasite that causes EPM (equine protozoal myeloencephalitis. The parasite is excreted from opossums in their manure which can then be ingested by the horse while grazing or drinking water.

Answer 2

EPM is contracted from eating foodstuffs or drinking water contaminated with possum feces. However, not all possums carry this parasite and only a very small number of horses that do become exposed actually contract EPM.

Answer 3

Equine Protozoal Myeloencephalitis (EPM for short) currently thought to be an infection with Sarcocystis parasites. The commonly cited route of exposure for horses is from opossums urinating or defecating in the water or feed for horses. This is more common in horses that are maintained and fed on pasture where opossums have easier access to the water trough and feed bunks.

Answer 4

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