<unk>  <unk> —also known as Dawson disease—is a rare form of chronic, progressive brain inflammation caused by slow infection with certain defective strains of hypermutated 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<unk> . However, a 2016 study estimated that the rate for unvaccinated infants under 15 months was as high as 1 in 609. No cure for<unk>  exists, and the condition is almost always fatal.<unk>  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.<unk>  is caused by the wild-type virus, not by vaccine strains.
Subacute sclerosing panencephalitis
Progressive multifocal leukoencephalopathy
Hashimoto's encephalopathy
Hereditary diffuse leukoencephalopathy with spheroids
Intravascular lymphomas
HIV-associated nephropathy
Toxic leukoencephalopathy
Progressive rubella panencephalitis