[1] Natl Inst Infect Dis, Infect Dis Surveillance Ctr, Musashimurayama, Tokyo 2080011, Japan
[2] Yamanobe Paediat Clin, Yamagata, Japan
[3] Yamagata Prefectural Inst Publ Hlth, Dept Microbiol, Yamagata 9900031, Japan
[4] Gunma Prefectural Inst Publ Hlth & Environm Sci, Gunma, Japan
[5] Life Technol Japan Ltd, Tech Support, Tokyo, Japan
[6] Natl Inst Infect Dis, Dept Virol 3, Musashimurayama, Tokyo 2080011, Japan
[7] Natl Inst Infect Dis, Dept Virol 1, Musashimurayama, Tokyo 2080011, Japan