The present paper filed 129 clinically defined cases of multiple sclerosis (MS) (the prevalence day on December 31, 1986) in Mureş County (Transylvania) out of a total population of 615,032 inhabitants, assessing the prevalence rate (20.97/100000) and a predominance of women (F/M = 1.34/1). Incidence (during the last 10 years: 0.86/100000), mortality (0.34/100000), lethality (0.033%) and death (1.83%) rates were also obtained.
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