EPM Study

Equine protozoal myeloencephalitis (EPM) is a serious and often fatal neurologic disease of equids. Animals affected by EPM can demonstrate a variety of clinical abnormalities, and signs can vary tremendously in severity. Classically, horses with EPM develop a variety of asymmetric neurologic deficits including gait abnormalities, ataxia, weakness, and muscle wasting. However, symmetric neurologic abnormalities are also seen frequently. 

According to the National Animal Health Monitoring System '98 Equine Study, the incidence of EPM was estimated in the year prior to the study to be 14 new cases per 10,000 horses per year. The majority of operations where EPM was reported had only identified a single case at any time during their history.

Among the last cases recognized on operations for which duration of illness was at least 3 months, 39.7 percent were reported to recover completely, 37.4 percent improved but did not completely recover, 14.4 percent were sold or given away because they had EPM, and 7.1 percent died or were euthanatized because of EPM.
http://www.aphis.usda.gov/vs/ceah/cahm/Equine/eq98epm.htm

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