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Department of Haematology, University College, London.
Clinical and laboratory findings are reported in nine patients who developed acute encephalopathy during the course of Lassa fever. The encephalopathy manifested 3-17 days after disease onset with confusion, followed rapidly by tremor (seven patients), grand mal convulsions (seven), abnormal posturing (three) and coma (eight); focal neurological signs and evidence of raised intracranial pressure were not seen. Eight patients died, most commonly from respiratory arrest following a protracted fit. Development of encephalopathy did not correlate with the presence of virus in cerebrospinal fluid (CSF), nor with virus antibodies in CSF and/or serum; thus, neither direct cytopathic nor immune-mediated mechanisms seem to be involved in its pathogenesis.
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