If treated, most individuals recover from<unk>  without long-term problems related to the illness. Mortality rates vary for those who do not receive treatment, for example being about 70% for herpes encephalitis but low for the La Crosse virus. Individuals who remain symptomatic after initial infection may have difficulty concentrating, behavior or speech disorders, or memory loss. Rarely, individuals may remain in a persistent vegetative state. The most common long-term complication of<unk>  is seizures that may occur in 10% to 20% of patients over several decades. These seizures are resistant to medical therapy. However, individuals who have unilateral mesial temporal lobe seizures after<unk>  have good results following neurosurgery. Prognoses related to specific viruses include: * For Eastern equine encephalitis, some children may experience seizures, severe mental retardation, and various forms of paralysis. * For Japanese encephalitis, extrapyramidal symptoms relating to motor function may remain. * For St. Louis encephalitis, low blood sodium level and excess, unsuppressable release of antidiuretic hormone * For Western equine encephalitis, some children may experience seizures and behavioral changes. * For pregnant women infected with Zika virus, the newborn child may have microcephaly. Other potential complications following<unk>  include: * Encephalopathy * Flaccid paralysis * Impaired intelligence * Low blood sodium level * Mononeuropathy * Mood and behavioral changes * Residual neurological deficits
Viral encephalitis
Anti-NMDA receptor encephalitis
Herpesviral encephalitis
Anti-Hu associated encephalitis
Powassan encephalitis
Autoimmune encephalitis
Fungal meningitis
Viral meningitis