Jamestown Canyon encephalitis with NORSE and electrographic response to ribavirin: a case report.

New-onset refractory status epilepticus (NORSE) is a rare condition where refractory seizures occur with no obvious cause in an otherwise healthy individual. We report here the first case of a patient with NORSE caused by Jamestown Canyon virus, an emerging virus throughout North America. This is the first patient with Jamestown Canyon virus encephalitis treated by a specific antiviral agent, in this case intravenous ribavirin, with electroencephalography (EEG) evidence of improvement. This is finally the first reported death caused by this virus, here secondary to intensive care unit complications. Therefore, Jamestown Canyon virus should be considered as a NORSE etiology, and ribavirin may be an effective treatment of that condition, especially if used early.