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

Fig. 23.17 Life-cycle of Diphyllobothrium latum

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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