Authors/National Vaccine Advisory Committee: Georges Peter, MD (chair), Brown Medical School, Providence, RI; Ann Margaret Arvin, MD, Stanford University School of Medicine, Stanford, Calif; Jeffrey P. Davis, MD, Wisconsin Division of Health, Madison, Wis; Michael D. Decker, MD, MPH, Aventis Pasteur, Swiftwater, Pa; Patricia Fast, MD, PhD, International AIDS Vaccine Initiative, New York, NY; Fernando A. Guerra, MD, MPH, San Antonio Metropolitan Health District, San Antonio, Tex; Charles M. Helms, MD, PhD, University of Iowa Hospital and Clinics, Iowa City; Alan Richard Hinman, MD, Task Force for Child Survival and Development, Decatur, Ga; Ruth Katz, JD, MPH, George Washington University School of Public Health and Health Services, Washington, DC; Jerome O. Klein, MD, Boston Medical Center, Boston, Mass; Mary Beth Koslap-Petraco, MS, CPNP, Suffolk County Department of Health Services, Lindenhurst, NY; Peter R. Paradiso, PhD, Wyeth Vaccines, Henrietta, NY; William Schaffner, MD, Vanderbilt University School of Medicine, Nashville, Tenn; Patricia N. Whitley-Williams, MD, Robert Wood Johnson Medical School, New Brunswick, NJ; Donald E. Williamson, MD, Alabama Department of Public Health, Montgomery; and Bruce Gellin, MD, executive secretary of NVAC, Washington, DC.