This research was supported by Research on Food Safety in Health and Labour Science Research Grant, Japan, from 2004–2006. We thank Gaku Takahashi (Chiba City Government, Japan), Hiroshi Ueyama (Edogawa-ku, Tokyo Metropolitan Government, Japan), Hajime Amano (Yokosuka City Government, Japan), Hiromi Nagaoka (Shizuoka Prefectural Government, Japan), Hiroshi Kanazawa (Shizuoka City Institute of Environmental Sciences and Public Health, Japan), Machi Inada (Nara Prefectural Government), Kazumi Horikawa (Fukuoka Institute of Health and Environmental Sciences, Japan), Yoshimasa Makimoto (Fukuyama City Public Health Center, Japan), Kikuyo Ogata (Oita Prefectural Institute of Health and Environment, Japan), Keiko Inoue (Oita City Public Health Center, Japan), Setsu Watanabe (Miyagi Prefectural Institute of Public Health and Environment, Japan), Jun Kudaka (Okinawa Prefectural Institute of Health and Environment, Japan), and other participants in this study in city and prefecture governments for their cooperation in collecting data on the outbreaks.
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