[1] Univ Penn, Perelman Sch Med, Dept Med, Philadelphia, PA 19104 USA
[2] Univ Penn, Perelman Sch Med, Dept Microbiol, Philadelphia, PA 19104 USA
[3] Duke Univ, Duke Human Vaccine Inst, Sch Med, Durham, NC 27710 USA
[4] Duke Univ, Dept Med, Sch Med, Durham, NC 27710 USA
[5] Boston Childrens Hosp, Lab Mol Med, Boston, MA 02115 USA
[6] Harvard Med Sch, Boston, MA 02115 USA
[7] NIAID, Vaccine Res Ctr, NIH, Bethesda, MD 20892 USA
[8] Duke Univ, Dept Immunol, Sch Med, Durham, NC 27710 USA
[9] Duke Univ, Dept Surg, Sch Med, Durham, NC 27710 USA
[10] Duke Univ, Dept Pediat, Sch Med, Durham, NC 27710 USA
[11] Los Alamos Natl Lab, Theoret Biol & Biophys, Los Alamos, NM 87545 USA
[12] Bioqual Inc, Rockville, MD 20850 USA
[13] Boston Univ, Dept Microbiol, Sch Med, Boston, MA 02118 USA
[14] Boston Univ, Dept Math & Stat, Boston, MA 02215 USA
[15] Harvard Med Sch, Howard Hughes Med Inst, Boston, MA 02115 USA