[1] NIAID, Hepatitis Viruses Sect, Infect Dis Lab, NIH, Bethesda, MD 20892 USA
[2] Univ Copenhagen Hosp, Dept Infect Dis, Copenhagen Hepatitis Program C, DK-2650 Hvidovre, Denmark
[3] Univ Copenhagen Hosp, Clin Res Ctr, DK-2650 Hvidovre, Denmark
[4] Univ Copenhagen, Fac Hlth Sci, Dept Int Hlth Immunol & Microbiol, DK-2200 Copenhagen N, Denmark
[5] Scripps Res Inst, Dept Mol & Expt Med, Div Expt Pathol, La Jolla, CA 92037 USA
[6] MD Anderson Canc Ctr, Michale E Keeling Ctr Comparat Med & Res, Dept Vet Sci, Bastrop, TX 78602 USA