D. latum is found in various terrestrial and marine fish-eating carnivores. The adult worm also parasitizes humans. It has been reported in geographic areas with fresh-water lakes in the subarctic and Eurasia, in the Siberian rivers Ob and Yenisei and in the Baltic Sea. A high prevalence has been observed in the Volga basin and Finland, the lake district of Italy and
Switzerland. Immigration has transported the disease to North and South America. It has been reported in a number of fish species: pike, perch, ruff, rainbow trout and turbot in Chile, and whitefish and salmon in the USA.
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