GIDEON (Global Infectious Diseases and Epidemiology Online Network) is a global infectious disease knowledge management tool. It is designed to assist in diagnosing infectious diseases and staying current on the latest trends in epidemiology and treatment. It also provides information on the history of outbreaks. Gideon is used for diagnosis and reference in the field of tropical and infectious diseases, epidemiology, microbiology and antimicrobial chemotherapy. There is detailed information on vaccines and vaccination throughout the world and an extensive section on worldwide travel. Access GIDEON at https://web.gideononline.com/loginx.php?user=yale.