<unk>  is a moderate to severe infection of the central nervous system.<unk>  belongs to the Group IV positive-sense ssRNA virus within the Togaviridae family of viruses, and the genus Alphavirus.<unk>  is closely related to western equine encephalitis and Venezuelan equine encephalitis.<unk>  virus is usually transmitted via mosquitos to the human host, primarily Culiseta melanura.<unk>  virus must be differentiated from other diseases that cause fever, headache, seizures, and altered mental status. There are approximately 8 human cases of<unk>  annually in the United States, most commonly affecting children under the age of 15 and adults over the age of 50. Prognosis for<unk>  is generally poor. Approximately 33% of patients progress to mortality, and approximately 50% of surviving patients have mild to severe neurodegenerative losses and seizures. The diagnostic method of choice for<unk>  virus is laboratory testing. There is no treatment for<unk>  virus; the mainstay of therapy is supportive care. There are currently no human vaccines available for<unk> .
Eastern equine encephalitis
Western equine encephalitis
Venezuelan equine encephalitis
St. Louis encephalitis
Japanese encephalitis
Tick-borne encephalitis
La Crosse encephalitis
Tick borne encephalitis