[1] Kobayashi Pediat Clin, Fujieda, Shizuoka 4260067, Japan
[2] Natl Inst Infect Dis, Infect Dis Surveillance Ctr, Tokyo 1628640, Japan
[3] Natl Inst Infect Dis, Dept Virol 2, Tokyo 2080011, Japan
[4] Hyogo Prefectural Inst Publ Hlth & Consumer Sci, Hyogo 6520032, Japan
[5] Kawasaki City Inst Publ Hlth, Kanagawa 2100821, Japan