1. Department of Microbiology, Graduate School of Medical Sciences Kumamoto University Kumamoto Japan
2. Department of Molecular Infectiology, Graduate School of Medicine Chiba University Chiba Japan
3. Pathogenic Microbe Laboratory, Research Institute National Centre for Global Health and Medicine Tokyo Japan
4. Department of Bacteriology I National Institute of Infectious Diseases Tokyo Japan
5. Department of Legal Medicine, Graduate School of Medicine Chiba University Chiba Japan
6. Division of Bacteriology Osaka Prefectural Institute of Public Health Osaka Japan
7. Cardiovascular and Pulmonary Branch, National Heart, Lung, and Blood Institute National Institutes of Health Bethesda MD USA