Subacute sclerosing panencephalitis (SSPE), also known as Dawson disease, is a rare form of progressive brain inflammation caused by a persistent infection with the measles virus. The condition primarily affects children, teens, and young adults. It has been estimated that about 2 in 10,000 people who get measles will eventually develop SSPE.[1] However, a 2016 study estimated that the rate for unvaccinated infants under 15 months was as high as 1 in 609.[2][3] No cure for SSPE exists, and the condition is almost always fatal. SSPE should not be confused with acute disseminated encephalomyelitis, which can also be caused by the measles virus, but has a very different timing and course.[4]
SSPE is caused by the wild-type virus, not by vaccine strains.[5][6]
SSPE is characterized by a history of primary measles infection, followed by an asymptomatic period that lasts 7 years on average but can range from 1 month to 27 years. After the asymptomatic period, progressive neurological deterioration occurs, characterized by behavior change, intellectual problems, myoclonic seizures, blindness, ataxia, and eventually death.[7][8]
EDIT
https://en.wikipedia.org/wiki/Subacute_sclerosing_panencephalitis
It's not subacute sclerosing panencephalitis - it's Freedom Measles!!!
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