1. Department of Microbiology, College of Medicine, Konkuk University, Choongju-si, Choongbuk 380-701
2. Institute of Biomedical Science and Technology, Konkuk University, Seoul 143-701
3. Department of Microbiology, Cheju National University College of Medicine, Jeju 690-756
4. Department of Microbiology, College of Natural Sciences, Pusan National University, Pusan 609-7352
5. Department of Microbiology and Immunology, Seoul National University College of Medicine and Institute of Endemic Disease, Seoul 110-799, Republic of Korea