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

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  • 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


Riedel, David, and Paul G Auwaerter. "Diphyllobothriasis." Johns Hopkins ABX Guide, The Johns Hopkins University, 2017. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540173/all/Diphyllobothriasis.
Riedel D, Auwaerter PG. Diphyllobothriasis. Johns Hopkins ABX Guide. The Johns Hopkins University; 2017. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540173/all/Diphyllobothriasis. Accessed April 21, 2019.
Riedel, D., & Auwaerter, P. G. (2017). Diphyllobothriasis. In Johns Hopkins ABX Guide. Available from https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540173/all/Diphyllobothriasis
Riedel D, Auwaerter PG. Diphyllobothriasis [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2017. [cited 2019 April 21]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540173/all/Diphyllobothriasis.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Diphyllobothriasis ID - 540173 A1 - Riedel,David,M.D. AU - Auwaerter,Paul,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 -