How Is EPM In Horses Contracted?

By Marcie Goodman


Equine protozoal myeloencephalitis or EPM in horses is a neurological disease that is caused by a small parasite. The parasite is carried by opossums. Equine are exposed to the disease if they eat feed or drink water which has been contaminated by feces from opossums.

The disease symptoms vary greatly. These depend on the part of the nervous system which has been attacked. The protozoa could cause the equine to be left with lesions on the spinal cord and the brain stem. This disease is most prevalent during the summer and the fall months, with the fall being the time it is found most. The symptoms are quite slow in developing and could be present many days after infection has occurred.

The diagnosis of EPM in horses is not easy due to the similarity to many other potential neurological diseases. The symptoms of the disease vary from equine to equine and may include muscle weakness and atrophy. The animal may experience difficulty when swallowing. The horse could suffer from a sore back, a lack of suitable co-ordination and weakness.

If the horse it suffering from a mild form of EPM, it may appear to stumble and suffer from slight lameness. This requires immediate treatment as a delay could end in the horse being unable to swallow or stand. At this point, the severity of the disease puts the horse at risk of death. The horse may suffer from a head that is tilted and eyelids that become droopy. Any breed, age or sex of horse may be affected by the disease. Horses that are transported frequently and younger horses are more at risk of contracting the disease.

Prevention of the disease is possible in stables that do not attract opossums as they are the carriers of the disease-causing organism. Opossums are not selective about their eating fancy. They eat virtually anything, including dead animals, horse feed, dog and cat food.

To stop opossums from invading your stables, you should secure all food stores. If you come across animal carcasses on your property, you should bury it as soon as possible. Food spillage should be cleaned up quickly and not left lying on the ground. If you fear opossums may already have invaded your property, you should attempt to trap them in a humane way and relocate them. There is specially designed fencing to keep opossums off your property. This should be considered if opossums are becoming a nuisance on your property and possible danger to your horses.

This disease is dangerous and if your equine has symptoms indicating possible infection, it should undergo a veterinary examination as soon as possible. An early diagnosis and adequate veterinary care will give the horse the opportunity to fully recover from the infection. However, the horse may suffer permanent damage due to the infection. The gait and normal movement of your horse will be the starting point of the vet's examination. Blood and spinal fluid tests should be done to eliminate diseases like the West Nile virus and viral encephalitis.

Different types of drugs will be used during treatment for EPM in horses. This will include anti-microbial, anti-protozoal and anti-inflammatory drugs. The treatment process for the disease is a lengthy and fairly expensive one. Unfortunately, the available treatment options are not always a success.




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