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)