1. School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea
2. International Vaccine Institute, San 4-8 Bongcheon 7 dong, Kwanak gu, Seoul 151-818, Republic of Korea
3. Interdisciplinary Program of Bioinformatics, Seoul National University, Seoul 151-742, Republic of Korea
4. The Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire CB10 1SA, UK
5. School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
6. Laboratory of Enteric Infections, Department of Microbiology, National Institute of Health Korea, Republic of Korea
7. Division of Infectious Disease, Samsung Medical Center, Seoul, Republic of Korea