Diphyllobothriasis (Fish tapeworm infection)

Parasitic Diseases, Cestodes (Tapeworms)

Animals Involved

Dogs, bears, seals, sea lions, gulls, and other fish­eating mammals and birds are definitive hosts; freshwater or marine fish (and copepods) are intermediate hosts

Known Distributions

Worldwide; distribution of species varies

Probable Means of Spreading

Ingestion of undercooked infected fish

Clinical Manifestations in People

Usually asymptomatic; may cause mild abdominal distress, diarrhea (chronic relapsing diarrhea possible in some cases)

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