Diphyllobothrium stemmacephalum (Cestoda: Diphyllobothriidae) found from a harbor porpoise in northern Japan,with comments on a geographical gap with human infection cases in southern Japan |
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| Affiliation: | 1. Department of Environmental Science, School of Life and Environmental Science, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan;2. Faculty of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-8611, Japan;3. Global Center for Food, Land and Water Resources, Hokkaido University, Kita 9 Nishi 10, Kita-ku, Sapporo 060-8589, Japan;1. Laboratory of Veterinary Parasitology, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonancho, Musashino, Tokyo 180-8602, Japan;2. Banquet Animal Hospital, Ikejiri, Setagaya, Tokyo, Japan;3. Den-en-chofu Animal Hospital, Denenchofu, Ota, Tokyo, Japan;1. Grupo de Investigación en Ciencias Animales GRICA, Facultad de Medicina Veterinaria y Zootecnia, Universidad Cooperativa de Colombia UCC, Bucaramanga, Colombia;2. Grupo de Investigación para el fortalecimiento de la salud y el bienestar GIFOSABI, Facultad de Enfermería, Universidad Cooperativa de Colombia UCC, Bucaramanga, Colombia;3. Centro de Investigaciones en Microbiología y Biotecnología-UR (CIMBIUR), Facultad de Ciencias Naturales, Universidad del Rosario, Bogotá, Colombia;1. Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia, Bulgaria;2. Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic;1. Laboratory of Parasitology, Joint Graduate School of Veterinary Medicine, Yamaguchi University, Japan;2. Laboratory of Nematology, Faculty of Agriculture, Saga University, Japan;3. Laboratory of Parasitology, School of Veterinary Medicine, Azabu University, Japan |
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| Abstract: | Even though the cetacean tapeworm Diphyllobothrium stemmacephalum occurs in both cold and warm waters, human infections and final host occurrences have been confined to temperate areas in and near Japan. We recently obtained a strobila of this cestode that was excreted from a harbor porpoise accidentally caught offshore of Hokkaido of northern Japan. Genetic analysis of 28S rDNA and cox1 genes confirmed that the cestode was D. stemmacephalum. Our finding sets the northernmost record of D. stemmacephalum in the western Pacific, suggesting that the risk of human infections by this parasite in northern Japan deserves further attention. |
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