1. Department of Preventive Dentistry; Health Sciences University of Hokkaido; Hokkaido 061-02 Japan
2. Division of Animal Experimentation; Sapporo Medical University; Sapporo Hokkaido 060 Japan
3. Department of Microbiology, School of Pharmaceutical Sciences; University of Shizuoka; Shizuoka Shizuoka 422 Japan
4. Unite de Bacteriology Moleculoire et Medicale, Institut Pasteur; Paris France
5. Hokkaido Rumoi Public Health Center; Rumoi Hokkaido 077 Japan
6. Department of Microbiology; Sapporo Medical University; Sapporo Hokkaido 060 Japan
7. Department of Dermatology; Medical School Yokohama City University; Yokohama Kanagawa 234 Japan
8. Department of Ophthalmology; Medical School Yokohama City University; Yokohama Kanagawa 234 Japan
9. Department of Medical Technology, Junior College; Saitama Medical School; Saitama 350-04 Japan