[1] Univ Miami, Dept Pediat, Miami, FL 33136 USA
[2] Univ Erlangen Nurnberg, Dept Dermatol, D-91052 Erlangen, Germany
[3] Univ Heidelberg, Inst Hyg, Dept Virol, D-69120 Heidelberg, Germany
[4] Univ Calif San Francisco, Howard Hughes Med Inst, Dept Med, San Francisco, CA 94143 USA
[5] Univ Calif San Francisco, Howard Hughes Med Inst, Dept Microbiol, San Francisco, CA 94143 USA
[6] Univ Calif San Francisco, Howard Hughes Med Inst, Dept Immunol, San Francisco, CA 94143 USA
[7] Tampere Univ, Inst Med Technol, FIN-33101 Tampere, Finland