Epidemiology
This autoimmune disease is very rare, possibly affecting as few as 1 in 1,000,000 persons. It shows no specific prevalence in either sex, has no known genetic predisposition and has no cure. Age of onset is usually 30–50 years of age, but can occur in children aged 3 years old and younger. At this age it is known as Stiff Baby Syndrome.
Read more about this topic: Stiff Person Syndrome