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First Record of Human Infection with the Tapeworm Diphyllobothrium nihonkaiense in North America

Barbara Wicht, Tomá Scholz^*, Raffaele Peduzzi, AND Roman Kuchta

Istituto Cantonale di Microbiologia, Bellinzona, Switzerland; Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, and Faculty of Science, University of South Bohemia, eské Bude jovice, Czech Republic

The tapeworm Diphyllobothrium nihonkaiense (Cestoda: Diphyllobothriidea), originally described from Japan, is reported from a man in North America for the first time. Species identification was based on sequences of ribosomal (partial 18S rRNA) and mitochondrial (partial Cytochrome c Oxidase subunit I) genes of proglottids expelled from a Czech tourist who ate raw Pacific sockeye salmon (Oncorhynchus nerka) from British Columbia, Canada.

Received September 4, 2007. Accepted for publication November 16, 2007.

Acknowledgments: The authors thank Lubo Piálek, Faculty of Science, University of South Bohemia, eské Budjovice, and Oleg Ditrich for invaluable help, and Martina Borovková, both Institute of Parasitology, BC AS CR, eské Budjovice for making histological sections. Helpful suggestions of three anonymous referees are also greatly appreciated.

Financial support: The present study was supported by the Grant Agency of the Czech Republic (projects Nos. 524/04/0342 and 524/03/H133), research projects of the Institute of Parasitology, Biology Centre of the Czech Academy of Sciences (Z60220518 and LC 522), and the research project of the Faculty of Science, University of South Bohemia (MSM 6007665801).

^* Address correspondence to Tomá Scholz, Institute of Parasitology, Biology Centre of the Czech Academy of Sciences & Faculty of Science, University of South Bohemia, Braniovská 31, 370 05 eské Budjovice, Czech Repulic. E-mail: tscholz{at}paru.cas.cz

Authors’ addresses: Barbara Wicht and Raffaele Peduzzi, Istituto Cantonale di Microbiologia, Via Mirasole 22a, 6500 Bellinzona, Switzerland, Telephone: +41(0)918146081, Fax: +41(0)918146019, E-mail: barbara.wicht{at}ti.ch and raffaele.peduzzi{at}ticino.com. Tomá Scholz and Roman Kuchta, Institute of Parasitology, Biology Centre of the Czech Academy of Sciences & Faculty of Science, University of South Bohemia, Braniovská 31, 370 05 eské Budjovice, Czech Republic, Telephone: +420385310351, Fax: +420385310388, E-mails: tscholz{at}paru.cas.cz and krttek{at}yahoo.com.