[1] Karolinska Univ Hosp Huddinge, Ctr Infect Med, Karolinska Inst, Dept Med, S-14186 Stockholm, Sweden
[2] Karolinska Inst, Microbiol & Tumorbiol Ctr, Stockholm, Sweden
[3] Swedish Inst Infect Dis Control, Dept Virol, Stockholm, Sweden
[4] Linkoping Univ, Dept Mol & Clin Med, Linkoping, Sweden
[5] Lund Univ, Dept Lab Med, Div Med Microbiol Virol, Lund, Sweden