Diphyllobothriasis

David Riedel, M.D., Paul G. Auwaerter, M.D.
Diphyllobothriasis is a topic covered in the Johns Hopkins ABX Guide.

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MICROBIOLOGY

  • Cestode (tapeworm) parasite, found worldwide, but concentrated in certain endemic areas.
  • The most important fish-borne zoonosis with complex 3-host life cycle:
    • Eggs ingested by crustacean and form first larval stage → crustacean ingested by a freshwater fish where plerocercoid (second larval stage) develops → humans contract infection by eating raw or undercooked freshwater fish, and the parasite matures rapidly in the intestine [Figure 1].
    • Major species is Diphyllobothrium latum (especially U.S. Great Lakes region and Alaska, Scandinavia, Russia), D. nihonkaiense (Japan), D. pacificum (Pacific coast of South America), D. dendriticum (Europe).
    • Cases also reported after eating imported fish.
    • At least 10 other species reported occasionally in humans.

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Last updated: July 30, 2017

Citation

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TY - ELEC T1 - Diphyllobothriasis ID - 540173 A1 - Auwaerter,Paul,M.D. AU - Riedel,David,M.D. Y1 - 2017/07/30/ BT - Johns Hopkins ABX Guide UR - https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540173/all/Diphyllobothriasis PB - The Johns Hopkins University DB - Pediatrics Central DP - Unbound Medicine ER -