Diphyllobothrium latum Homepage
Common name: Broad Fish Tapeworm
Genus : Diphyllobothrium
The adult worms are up to 2 m in length and gravid proglottids have a tightly coiled uterus full of brown eggs.
Adult D. latum
Proglottid of D. latum
The egg hatches in water releasing a ciliated, free-swimming coracidium. A copepod ingests the coracidium and it develops into a procercoid in the body cavity. When a fish ingests the infected copepod, the procercoid will migrate to the muscles or viscera and develop to the pleurocercoid stage. If the second intermediate host is eaten by another fish the pleurocercoid will migrate to the muscles or viscera of the new (paratenic) host. When the host containing the pleurocercoid is ingested by a definitive host the worm attaches to the small intestine wall and begins to develop proglottids. The prepatent period is 3 to 4 weeks. Eggs are released from the gravid proglottids and pass out in the feces.
Common Diagnostic Test
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