[1] NIAID, NIH, 9000 Rockville Pike, Bethesda, MD 20892 USA
[2] NIAID, Div Microbiol & Infect Dis, 9000 Rockville Pike, Bethesda, MD 20892 USA
[3] NIAID, Div Allergy Immunol & Transplantat, 9000 Rockville Pike, Bethesda, MD 20892 USA
[4] NIAID, Vaccine Res Ctr, 9000 Rockville Pike, Bethesda, MD 20892 USA