University of Pittsburgh - Department of Pediatrics, University of Maryland, Baltimore (UMB) - School of Medicine, Fred Hutchinson Cancer Research Center, affiliation not provided to SSRN, Fred Hutchinson Cancer Research Center, University of California, San Diego (UCSD) - Division of Infectious Diseases and Global Public Health, University of South Florida - Morsani College of Medicine, Emory University School of Medicine and Children’s Healthcare of Atlanta - Department of Pediatrics, Ndlovu Research Centre, Harvard University - Brigham and Women’s Hospital, Baylor College of Medicine, Instituto Nacional de Infectologia Evandro Chagas, Fiocruz - Lab. De Pesquisa Clinica DST/AIDS, South African Medical Research Council, University of North Carolina (UNC) at Chapel Hill - School of Medicine, Fred Hutchinson Cancer Research Center - Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Fred Hutchinson Cancer Research Center, Fred Hutchinson Cancer Research Center - Vaccine and Infectious Disease Division, Moderna, Inc., AstraZeneca Pharmaceuticals, Janssen Research & Development, LLC, Novavax, Inc., - Center for Vaccine Development and Global Health, Fred Hutchinson Cancer Research Center - Vaccine and Infectious Disease Division, University of Alabama at Birmingham - Heersink School of Medicine, Harvard University - Brigham and Women’s Hospital, Government of the United States of America - Biostatistics Research Branch and - Department of Pediatrics