[1] Bernhard Nocht Inst Trop Med, D-20359 Hamburg, Germany
[2] Univ Hamburg, Heinrich Pette Inst Expt Virol & Immunol, D-2000 Hamburg, Germany
[3] Univ Bari, Clin Malattie Infettive, I-70121 Bari, Italy
[4] Univ Munich, Klinikum Grosshadern, Med Klin 2, D-80539 Munich, Germany
[5] Univ Naples 2, Clin Malattie Infettive, Naples, Italy
[6] Univ Hamburg, Krankenhaus Eppendorf, Chirurg Klin, D-2000 Hamburg, Germany