1. Research Center for Drug and Vaccine Development, National Institute of Infectious Diseases, Tokyo, Japan
2. Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan
3. Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan
4. Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
5. Department of Applied Biological Science, Tokyo University of Science, Noda, Japan
6. Department of Virology I, National Institute of Infectious Diseases, Tokyo, Japan
7. MIRAI, Japan Science and Technology Agency (JST), Saitama, Japan