University:
University of Cambridge
Course:
MBBS | Bachelor of Medicine Bachelor of Surgery
Academic year:

2021
Views:

279

Pages:

4
Author:

Nicole W.

Fasciola HepaticaIntroduction- also known as common liver fluke- Class - Trematoda- Phylum - Platyhelminthes- Habitat - liver and bile ductHosts : they are digeneticDefinitive hosts : Human,Sheep, CattleIntermediate hosts : 1st - fresh water snails , 2nd - watercress, grassTransmission - humans get infection by ingestion of 2nd intermediate host.Morphology -exists in 3 forms : adult worm, egg and larvae* Adult worms-Unsegmented and dorsoventrally flattened- Have 2 suckers- Incomplete digestive , excretory and nervous system- Body covered by integument - spines, papillae, tubercles- Body cavity is absent - Circulatory and respiratory organs are absent- Excretory system: flame cells and collecting tubules- Nervous system: paired ganglion cells- Well developed reproductive system- Hermaphrodites- Both self and cross fertilisation can occur* Eggs- oviparous- Operculated eggs ( has a lid like opening )- Oval and bile stained- Unembryonated* Larvae- 5 larvael forms : Miracardium, sporocyst, redia, cercaria, metacercaria (infective formfor definitive host)Life Cycle -ODPDxServicio -CDCLIFE CYCLEDefinitive host : Primary definitive host issheep, but it's also found in biliary tract ofman.

Fasciola hepatica

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