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Received February 25, 2004. Accepted for publication June 8, 2004.
Acknowledgments: Masao Satoh, Yukako Naitoh, Seiji Kondo, and Mari Kobayashi visited Kunashiri Island through the program of Japanese and Russian specialists exchange without visa hosted by the Marine Wildlife Center of Japan (Incorporated Non Profit Organization). We thank Dr. P.M. Schantz (Centers for Disease Control and Prevention, Atlanta, GA) for improving this manuscript.
Financial support: This work was supported by the Nippon Foundation, the Pro Nature Foundation-Japan, the Japan Fund for Global Environment, the Sonpo Japan Environment Foundation, and the Keidanren Nature Conservation Fund, and by a grant-in-aid for the Scientific Research sponsored by the Japanese Society for Promotion of Science (14256001) to Akira Ito.
* These authors contributed equally to this work.
Authors addresses: Masao Satoh, Department of Allergy and Immunology, Saitama Medical School, Morohongo 38, Moroyama, Irumagun, Saitama, 350-0495 Japan, Telephone: 81-492-76-1173, Fax: 81-492-94-2274, E-mail: satoma{at}saitama-med.ac.jp. Kazuhiro Nakaya, Animal Laboratory for Medical Research, Asahikawa Medical College, Asahikawa, Japan. Minoru Nakao, Ning Xiao, Hiroshi Yamasaki, Yasuhito Sako, and Akira Ito, Department of Parasitology, Asahikawa Medical College, Midorigaoka-Higashi 2-1-1-1, Asahikawa, 078-8510, Japan. Yukako Naitoh, Laboratory of Ecology and Genetics, Graduate School of Environmental Earth Science, Hokkaido University, Nishi 5, Kita 10, Kita-ku, Sapporo, 060-0810, Japan. Seiji Kondo, Animal Production System, Graduate School of Agriculture, Hokkaido University, Nishi 9, Kita 9, Kita-ku, Sapporo, 060-8589, Japan. Mari Kobayashi and Noriyuki Ohtaishi, Marine Wildlife Center of Japan, 1-35-103, Nishi 6, Kita 21, Kita-ku, Sapporo, 001-0021, Japan.
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