Cerebrospinal Fluid/cytology; Creutzfeldt-Jakob Syndrome/cerebrospinal fluid; Creutzfeldt-Jakob Syndrome/immunology; Encephalitis/cerebrospinal fluid; Encephalitis/immunology; Leukocytosis/immunology; Aged; Akinetic Mutism/etiology; Akinetic Mutism/pathology; Akinetic Mutism/physiopathology; Atrophy/immunology; Atrophy/pathology; Atrophy/physiopathology; Brain/immunology; Brain/pathology; Brain/physiopathology; Creutzfeldt-Jakob Syndrome/physiopathology; Dementia/etiology; Dementia/pathology; Dementia/physiopathology; Disease Progression; Encephalitis/physiopathology; Fatal Outcome; Female; Humans; Leukocyte Count; Leukocytosis/physiopathology; Magnetic Resonance Imaging; Movement Disorders/etiology; Movement Disorders/pathology; Movement Disorders/physiopathology; Neurons/metabolism; Neurons/pathology; Prions/metabolism