Keywords:
Dibothriocephalus nihonkaiensis; Tapeworm infection; environmental source of infection; rural Japan.
Abstract:
Dibothriocephalus nihonkaiensis is a zoonotic tapeworm transmitted to humans through consumption of raw or undercooked fish or wild meat. Between 2022 and 2023, Yamagata Prefecture reported an increase in cases compared with 2017-2021, when none were observed. We conducted a clinical and environmental investigation to clarify infection sources.