Address: 1Vaccine Branch, NCI, NIAID, NIH, Bethesda, MD 20892, USA, 2Division of Information and Mathematical Sciences, Genome Institute of Singapore, 138672, Singapore, 3Laboratory Of Clinical Investigation, NIAID, NIH, Bethesda, MD 20892, USA, 4Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD, 20892, USA, 5Advanced BioScience Laboratories, Inc., Kensington, MD 20895, USA, 6Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, LA 70112, USA and 7Southern Research Institute, Frederick, MD, USA