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Case Report: Leptospirosis by Wild Rat Bite in Winter in Tokyo Metropolitan Area, Japan

Tetsuya SuzukiDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;
Emerging and Re-emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Japan;

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Shinichiro MoriokaDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;
Emerging and Re-emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Japan;

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Tatsuya KikuchiDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;

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Lubna SatoDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;

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Hidetoshi NomotoDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;
Emerging and Re-emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Japan;

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Kei YamamotoDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;

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Nobuo KoizumiDepartment of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan;

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Kayoko HayakawaDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;

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Satoshi KutsunaDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;
Department of Infection Control, Graduate School of Medicine/Faculty of Medicine, Osaka University, Osaka, Japan

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Norio OhmagariDepartment of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan;
Emerging and Re-emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Japan;

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ABSTRACT.

We report a case of leptospirosis in Tokyo in winter due to a rat bite, an uncommon cause of Leptospira infection. In Japan, many cases due to exposure to fresh water have been reported from domestic southwest islands in summer. However, a previous report on leptospirosis in Tokyo documented several cases occurring in winter. The main route of infection in the Tokyo metropolitan area during winter was attributed to the increased chance of direct rat exposure. Rapid and feasible diagnostic methods are needed to elucidate its epidemiology and provide prompt treatment.

Author Notes

Address correspondence to Tetsuya Suzuki, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan. E-mail: tesuzuki@hosp.ncgm.go.jp

Financial support: K. Y. received research grants from Fujirebio, Inc., Mizuho Medy, Co., Ltd., and VisGene Inc., Sanyo Chemical Industries, Ltd., outside the submitted work.

Authors’ addresses: Tetsuya Suzuki, Shinichiro Morioka, Hidetoshi Nomoto, and Norio Ohmagari, Department of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan, and Emerging and Re-emerging Infectious Diseases, Graduate School of Medicine, Tohoku University, Sendai, Japan, E-mails: tesuzuki@hosp.ncgm.go.jp, shmorioka@hosp.ncgm.go.jp, hnomoto@hosp.ncgm.go.jp, and nohmagari@hosp.ncgm.go.jp. Tatsuya Kikuchi, Lubna Sato, Kei Yamamoto, and Kayoko Hayakawa, Department of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan, E-mails: tkikuchi@hosp.ncgm.go.jp, rsato@hosp.ncgm.go.jp, kyamamoto@hosp.ncgm.go.jp, and khayakawa@hosp.ncgm.go.jp. Nobuo Koizumi, Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan, E-mail: nkoizumi@niid.go.jp. Satoshi Kutsuna, Department of Infectious Diseases, Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan, and Department of Infection Control, Faculty of Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan, E-mail: kutsuna@hp-infect.med.osaka-u.ac.jp.

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