1. Department of Pediatrics, Tokyo Women's Medical University Yachiyo Medical Center, 477-96 Owada-Shinden, Yachiyo, Chiba 2768524, Japan
2. Laboratory of Bacterial Genomics, Pathogen Genomics Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
3. Department of Pediatrics, Showa General Hospital, 2-450 Tenjin, Kodaira, Tokyo 187-8510, Japan
4. Department of Pathology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
5. Department of Pediatrics, Graduate School of Medicine, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
6. Department of Virology 1, National Institute of Infectious Diseases, 4-7-1 Gakuen Musashimurayama, Tokyo 208-0011, Japan
7. Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu City, Tokyo 183-8509, Japan