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Question

Which of the following stages in the life history of liver fluke infects the primary host?

A
Metacercariae
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B
Miracidium
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C
Cercaria
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D
Redia
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Solution

The correct option is D Metacercariae
  • Platyhelminthes contain worms that cause parasitic and non-parasitic infections in humans and other mammals. Liver fluke is an endoparasite.
  • The fluke completes its life cycle with the help of two hosts. The primary host is sheep and its secondary or intermediary host is the freshwater snail.
  • Liver fluke infects the snail at the miracidium stage and sheep at the metacercaria stage. Hence, option A is correct.

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