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 avoid invasion from these animals, ensure that all food stores are secure. If there are animal carcasses on the property, ensure that they are buried as quickly as possible. Spilled feed should be cleaned up promptly and not left lying around. If you suspect that opossums are on your property, you should trap them in a humane manner and remove them. It is possible to obtain fencing that has been specially designed to keep them out. This is a good option to consider if opossums have become a nuisance on your property.

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.

The treatment process for EPM in horses may include a variety of drugs which the veterinary surgeon will administer. The length of the treatment process could be long and expensive. The downside of the lengthy treatment process is that it is not guaranteed to be a success.




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