There have been several proposed diagnostic criteria for<unk> . One, which has been widely accepted, includes an acute or subacute encephalitic illness where all other known causes of encephalitis have been excluded. Another diagnostic criterion, suggested more recently, says that the diagnosis of<unk>  "may be considered if the patient's condition cannot be attributed to any other known neurological condition and that they show the following signs: influenza-like signs; hypersomnolence (hypersomnia), wakeability, ophthalmoplegia (paralysis of the muscles that control the movement of the eye), and psychiatric changes."
Encephalitis lethargica
Japanese encephalitis
Powassan encephalitis
Eastern equine encephalitis
Saint Louis encephalitis
Brain fever
Tick-borne encephalitis
Limbic encephalitis