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During its life-cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stages respectively:

1. miracidium and metacercaria
2. redia and miracidium
3. cercaria and redia
4. metacercaria and cercaria

Correct answer: miracidium and metacercaria

Solution

In Fasciola hepatica, the miracidium penetrates the snail, which is the intermediate host. The metacercaria is the encysted infective stage for the definitive (primary) host after ingestion.

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