1. Hiroshima Prefectural Technology Research Institute, Public Health and Environment Center, Hiroshima, Japan.
2. Department of Microbiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
3. Hiroshima Prefectural Western Center for Public Health, Hiroshima, Japan.
4. Fukuoka City Institute of Hygiene and the Environment, Fukuoka, Japan.
5. Kumamoto Prefectural Institute of Public-Health and Environmental Science, Kumamoto, Japan.
6. Kumamoto City Environmental Research Institute, Kumamoto, Japan.
7. Oita Prefectural Institute of Health and the Environment, Oita, Japan.
8. Takasaki City Health Center, Takasaki, Japan.
9. Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan.
10. Pathogen Genomics Center, National Institute of Infectious Diseases, Tokyo, Japan.
11. Department of Food and Nutrition, Faculty of Home Economics, Tokyo Kasei University, Tokyo, Japan.
12. Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan.
13. School of Medical Technology, Faculty of Health Science, Gunma Paz University, Takasaki, Japan.
14. Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan.
15. Kyushu University, Fukuoka, Japan.