<unk>  is a rare chronic, progressive encephalitis that affects primarily children and young adults, caused by defective measles virus (which can be a result of a mutation of the virus itself).<unk>  is 'incurable' but the condition can be managed by medication if treatment is started at an early stage. Much of the work on<unk>  has been completed by the NINDS.
Subacute sclerosing panencephalitis
Progressive multifocal leukoencephalopathy
Hashimoto's encephalopathy
HIV associated nephropathy
Feline spongiform encephalopathy
Transmissible spongiform encephalopathy
Lymphocytic choriomeningitis
Serum sickness