[1] Erasmus MC, Dept Virol, POB 2040, NL-3000 CA Rotterdam, Netherlands
[2] Erasmus MC, Natl Influenza Ctr, NL-3000 CA Rotterdam, Netherlands
[3] Univ Wisconsin, Sch Vet Med, Dept Pathobiol Sci, Madison, WI 53706 USA
[4] Univ Tokyo, Inst Med Sci, Int Res Ctr Infect Dis, Dept Microbiol & Immunol,Dept Virol, Tokyo 1088639, Japan
[5] Univ Oxford, Clin Res Unit, Hosp Trop Dis, Ho Chi Minh City, Vietnam