DefinitionSubacute sclerosing panencephalitis (SSPE) is a progressive, debilitating, and deadly brain disorder related to measles (rubeola) infection.Alternative NamesSSPE; Subacute sclerosing leukoencephalitis; Dawson's encephalitisCauses, incidence, and risk factorsOrdinarily, the measles virus does not cause brain damage, but an abnormal immune response to measles or, possibly, certain mutant forms of the virus may cause severe illness and death. This leads to brain inflammation (swelling and irritation) that may last for years.SSPE has been reported in all parts of the world, but in western countries it is considered a rare disease.Fewer than 10 cases per year are reported in the United States, a dramatic decrease that followed the nationwide measles immunization program. However, in s