1. Department of Medicine, University of Vermont College of Medicine, Burlington, Vermont 05405
2. Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California 92037
3. MWH Laboratories, Monrovia, California 91016
4. Division of Vaccine Discovery, La Jolla Institute of Allergy and Immunology, La Jolla, California 92037
5. Carolina Vaccine Institute, Departments of Genetics and Microbiology & Immunology, University of North Carolina—Chapel Hill School of Medicine, Chapel Hill, North Carolina 27599
6. PaxVax, Inc., San Diego, California 92121
7. Departments of Molecular Biology and Biochemistry and Community and Environmental Medicine, University of California, Irvine, California 92697