Korean J Parasitol.  2013 Aug;51(4):471-473. 10.3347/kjp.2013.51.4.471.

A Case of Diphyllobothrium nihonkaiense Infection as Confirmed by Mitochondrial COX1 Gene Sequence Analysis

  • 1Department of Internal Medicine, Chuncheon Sacred Heart Hospital, Chuncheon 200-704, Korea. yoonjh@hallym.or.kr
  • 2Department of Parasitology, School of Medicine, Chungbuk National University, Cheongju 361-763, Korea.


Diphyllobothrium nihonkaiense has been reported in Korea as Diphyllobothrium latum because of their close morphologic resemblance. We have identified a human case of D. nihonkaiense infection using the mitochondrial cytochrome c oxidase subunit I (cox1) gene sequence analysis. On 18 February 2012, a patient who had consumed raw fish a month earlier visited our outpatient clinic with a long tapeworm parasite excreted in the feces. The body of the segmented worm was 2 m long and divided into the scolex (head) and proglottids. It was morphologically close to D. nihonkaiense and D. latum. The cox1 gene analysis showed 99.4% (340/342 bp) homology with D. nihonkaiense but only 91.8% (314/342 bp) homology with D. latum. The present study suggested that the Diphyllobothrium spp. infection in Korea should be analyzed with specific DNA sequence for an accurate species identification.


Diphyllobothrium nihonkaiense; Diphyllobothrium latum; DNA; sequence; cox1; diagnosis
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