[1] Univ Massachusetts, Sch Med, Ctr Infect Dis & Vaccine Res, Worcester, MA 01655 USA
[2] Univ Indonesia, Fac Med, Dept Microbiol, Jakarta, Indonesia
[3] USA, Armed Forces Res Inst Med Sci, Med Component, Dept Virol, Bangkok, Thailand
[4] Bangkok Childrens Hosp, Dept Infect Dis, Bangkok, Thailand