Diphyllobothriasis - Diphyllobothrium Life Cycle

1) Unembryonated eggs passed in feces

2) Eggs embryonate in water

3) Coracidia hatch from eggs and are ingested by crustaceans.

4) Procercoid larvae in body cavity of crustaceans

5) Infected crustacean ingested by small freshwater fish Procercoid larva released from crustacean, develops into plerocercoid larva

6) Predator fish eats infected small fish

7) Human ingests raw or undercooked, infected fish

8) Adults in small intestine

9) Proglottids release immature eggs



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