1. Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland (D.F., O.D.B.)
2. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington (H.E.J.)
3. Moderna, Cambridge, Massachusetts (H.Z., B.G., J.M.M.)
4. Weill Cornell Medicine, New York, New York (K.M.)
5. Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland (K.K., K.M.N.)
6. Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, and Division of Infectious Diseases, Centre Hospitalier de l’Université de Montréal, Montreal, Quebec, Canada (M.D.)
7. Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, and Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington (L.C.)
8. Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas (H.M.E.)
9. Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts (L.R.B.).