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Animal Kingdom
Phylum Platyhelminthes: Life Cycle of Liver Fluke
1 question from 1 paper, each with its answer.
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Concepts tested
- Infective stages of Fasciola
All Questions
2003 AIPMT 1 question
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During its life-cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stage respectively :The liver fluke has two hosts: the primary (definitive) host is the sheep (or cattle), and the intermediate host is a freshwater snail (Lymnaea).
Eggs pass out with the faeces of the sheep and hatch in water into ciliated miracidium larvae. The miracidium bores into the snail; so the miracidium is the stage infective to the intermediate host.
Inside the snail it develops through sporocyst, redia and cercaria stages.
Cercariae leave the snail, encyst on grass or aquatic plants, and become metacercariae. When a sheep eats this grass, the metacercaria infects it; so the metacercaria is the stage infective to the primary host.
So the stages are miracidium (intermediate host) and metacercaria (primary host).