Affiliation: | National Center for Global Health and Medicine, Tokyo, Japan (S. Kutsuna, Y. Kato, M. Ota, K. Shinohara, T. Kobayashi, K. Yamamoto, Y. Fujiya, M. Mawatari, T. Sato, J. Kunimatsu, N. Takeshita, K. Hayakawa, S. Kanagawa, N. Ohmagari);National Institute of Infectious Diseases, Tokyo (M.L. Moi, A. Kotaki, T. Takasaki) |