Images:
Entire worm, scolex, protoscoleces:
http://www.k-state.edu/parasitology/625tutorials/Tapeworm03.html
Life cycle:
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Gross
anatomy and histology of a hydatid cyst. |
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Gross
anatomy |
Histology |
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Phylogeny:
Class Cestoda, Order Cyclophyllidea
Preferred definitive host:
Carnivores, particularly dogs
Reservoir hosts:
Other mammals
Vector/intermediate host:
Herbivores, particularly moose, reindeer, goats, camels and sheep. Humans are
'accidental' hosts.
Geographical location:
Cosmopolitan
Organs affected:
Cysts may develop in bone marrow, nervous system, liver, and lungs.
Symptoms and clinical signs:
Specific symptoms depend on the site of cyst formation. In general, the
presence of the cyst will induce pressure in organs and cause necrosis. Hydatid
fluid can induce anaphylactic shock and death.
Treatment:
Surgical removal of the cyst is required.