• Onset

There are about 300,000 patients suffering from Multiple Sclerosis in the North America today. The age of onset peaks between 20 and 30 years. Almost 70% of patients manifest symptoms between ages 21 and 40. Disease rarely occurs prior to 10 or after 60 years of age. However, patients as young as 3 and as old as 67 years of age have been described. Like other immuno- mediated diseases, females are affected more frequently than males (1.4 to 3.1 times as many women than men affected.)