Dicrocoelium dendriticum Epidemiology Quiz

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Questions and Answers

What are the key features of the epidemiology of Dicrocoelium dendriticum?

The long periods required for parasite development in the two intermediate hosts, and the long survival periods for the eggs, even in freezing temperatures.

Where does Dicrocoelium dendriticum occur and in which hosts?

D. dendriticum occurs in a wide range of domestic and free-ranging mammals in various parts of the world. In Canada, it has been reported from cattle and sheep in Alberta, especially in the Cypress Hills where it also infects elk, and in British Columbia.

Describe the morphology of adult Dicrocoelium dendriticum.

Adult D. dendriticum are small and lancet-shaped, measuring up to approximately 10 mm by 2.5 mm. The oral and ventral suckers, and many internal structures, particularly elements of the alimentary and reproductive systems, can easily be seen microscopically in fixed, stained specimens.

What are the characteristics of the eggs of Dicrocoelium dendriticum?

<p>The eggs are approximately 40 µm in length, not quite oval with a thick, yellow-brown, smooth shell and an operculum.</p> Signup and view all the answers

In which region are wapiti (elk) common hosts for Dicrocoelium dendriticum, and how does this relate to the parasite's spread?

<p>In the Cypress Hills of southwestern Saskatchewan and southeastern Alberta, wapiti (elk) are common hosts for D. dendriticum, which can act as reservoir hosts for sympatric cattle, in which the fluke also occurs.</p> Signup and view all the answers