Saint Louis encephalitis
（重定向自Saint Louis encephalitis virus）
_virus_EM_PHIL_1871_lores2431.JPG")
![Human incidence of Saint Louis encephalitis in the United States, 1964-1998.](/Images/godic/202502/08/St_louis_encephalitis_map2431.PNG")
Saint Louis encephalitis is a disease caused by the Mansonia pseudotitillans mosquito borne Saint Louis encephalitis virus. Saint Louis encephalitis virus is related to Japanese encephalitis virus and is a member of the Flaviviridae subgroup. This disease mainly affects the United States. Occasional cases have been reported from Canada and Mexico.