How Is EPM In Horses Contracted?

By Marcie Goodman


A disease called EPM in horses is caused by a tiny parasite which affects the neurological systems. The parasite responsible for this is found in opossums. Horses generally come into contact with the parasite if their feed or water has been contaminated by opossum feces.

The symptoms of the disease vary. This is dependent upon the point of attack in the nervous system. The protozoa may leave the horse with lesions on its brain stem and spinal cord. The disease is most common during the fall and summer months, however fall seems to be the worst time. Symptoms are fairly slow in developing and may be present several days after infection.

It is quite difficult to diagnose EPM in horses as the symptoms are similar to several other neurological diseases. The symptoms vary from one horse to another and may include muscle atrophy and weakness. The animal may have difficulty in swallowing. The horse may experience a sore back, weakness and lack of co-ordination.

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.

Since opossums carry the disease-causing organism, you should make the area as unattractive to them as possible to aid in preventing the disease. Opossums are known to not be very selective about what they eat. They will eat anything, from cat food to dead animals.

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 is a dangerous disease and horses that show signs of it should be examined by a veterinary specialist as soon as possible. A quick diagnosis and proper veterinary care will allow the horse to recover from the disease. The infection may leave the animal with permanent damage. The vet will normally examine the movement and gait of the equine. It is vital that spinal fluid and blood tests are undertaken to rule out diseases such as viral encephalitis and West Nile virus.

Treatment for EPM in horses often includes anti-inflammatory, anti-microbial and anti-protozoal drugs which will be administered by the veterinary surgeon. The treatment for this disease may take a long time and could become quite expensive. Unfortunately, it is often not successful.




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