The mosquito-borne virus, Japanese encephalitis virus (JEV), does not just occur in Japan. JEV also occurs in many regions of the Far East. However, the United States does not recommend the JEV vaccine for everyone traveling to the Far East. Rather, the vaccine is recommended based on aspects of travel such as location, length of stay and planned activities.
Reviewed by Paul A. Offit, MD, Lori Handy, MD, MSCE on February 21, 2017