1. Center for Surveillance, Immunization, and Epidemiologic Research, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
2. Center for Clinical Sciences, National Center for Global Health and Medicine, Shinjuku, Tokyo, Japan.
3. Department of Pathology, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
4. Research Center for Drug and Vaccine Development, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
5. Nakanoegota Hospital, Nakano, Tokyo, Japan.
6. Okabe Hospital, Kanazawa, Ishikawa, Japan.
7. Kanazawa City Health Center, Kanazawa, Ishikawa, Japan.
8. Fukuoka Kinen Hospital, Fukuoka, Fukuoka, Japan.
9. JCHO Tokyo Shinjuku Medical Center, Shinjuku, Tokyo, Japan.
10. Yamada Memorial Hospital, Sumida, Tokyo, Japan.
11. Chuo Public Health Center, Chuo, Tokyo, Japan.
12. Tokyo Metropolitan Bokutoh Hospital, Sumida, Tokyo, Japan.
13. Yoron Tokushukai Hospital, Oshima, Kagoshima, Japan.
14. Center for Field Epidemic Intelligence, Research and Professional Development, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
15. Department of Virology 1, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
16. Center for Emergency Preparedness and Response, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
17. Department of Veterinary Science, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.
18. Department of Microbiology, Kansai Medical University, Hirakata, Osaka, Japan.
19. Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases, Musashimurayama, Tokyo, Japan.
20. Deputy Director-General, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.