text: <unk>  is a mild to moderate 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 eastern equine encephalitis virus and Venezuelan equine encephalitis virus.<unk>  virus is usually transmitted via mosquitos to the human host, primarily Culiseta melanura and Culex tarsalis.<unk>  virus must be differentiated from other diseases that cause fever, headache, seizures, and altered mental status.<unk>  was last observed in humans in the United States in 1999. Prognosis for<unk>  is generally good;<unk>  is considered more mild than eastern equine encephalitis. Neuroinvasive vs non-neuroinvasive<unk>  can be differentiated based on both clinical and laboratory findings. The diagnostic method of choice for<unk>  is laboratory testing. The positive presence of IgM antibodies is diagnostic of<unk> . There is no treatment for<unk> ; the mainstay of therapy is supportive care. There are currently no human vaccines available for<unk> .
option_0: Western equine encephalitis
option_1: Eastern equine encephalitis
option_2: Venezuelan equine encephalitis
option_3: St. Louis encephalitis
option_4: Tick-borne encephalitis
option_5: Japanese encephalitis
option_6: Tick borne encephalitis
option_7: La Crosse encephalitis