The first report of a non-autochthonous human case of diphyllobothriosis in the state of Paraná, Brazil

Diphyllobothriosis is a zoonotic disease caused by consuming raw or undercooked fish contaminated with fish tapeworms, and it is emerging as a global public health issue. Although cases have been reported in several Brazilian states, this study describes the first non-autochthonous human case of diphyllobothriosis in Paraná, Brazil, specifically in Curitiba. The following case is presented: a 31-year-old woman developed symptoms after eating raw fish during a trip to Pucón, Chile. Molecular analysis of the expelled proglottids confirmed the presence of Diphyllobothrium species, with epidemiological evidence supporting the identification of Diphyllobothrium latum. This study is the first to report a non-autochthonous human case of diphyllobothriosis in Paraná, Brazil. This case highlights the importance of considering parasitic infections in the differential diagnosis of patients with gastrointestinal symptoms and a history of international travel, especially to regions where the disease is endemic.