Subacute sclerosing panencephalitis (SSPE) is a known rare cause of progressive myoclonic encephalitis of childhood and young adults due to a persistent measles virus infection. It is usually characterised by myoclonic jerks, cognitive decline , typical EEG findings that clinches its diagnosis and further supported by a high CSF and serum measles antibody titre.
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S Baiakmenlang (2019) studied this question.
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