ABSTRACT
Cestodes belonging to the genera Diphyllobothrium, Adenocephalus, and Diplogonoporus have a tape- or ribbon-like shape, and their larval plerocercoids that are parasitic in fish are infective to humans. Therefore, these cestodes are referred to as broad fish tapeworms. These genera include many species capable of infecting humans and causing diphyllobothriosis and diplogonoporiosis. Thus, the infections with these tapeworms frequently occur in countries and regions where people consume raw fish, such as Japan, Far East Russia, Europe, and the Pacific coast of North and South Americas. 1–5 These fishborne cestodioses have existed for thousands of years in these regions, as revealed by archaeological surveys. 6
