Medical Research Council, Respiratory and Meningeal Pathogens Research Unit, and Department of Science and Technology–National Research Foundation, Vaccine Preventable Diseases, University of the Witwatersrand (S.A.M., C.L.C.), and Shandukani Research Centre, Wits Reproductive Health and HIV Institute (M.S.M.), Johannesburg; Setshaba Research Centre, Soshanguve (K.A., A.O.), and Family Centre for Research with Ubuntu, Department of Paediatrics and Child Health, Stellenbosch University, Tygerberg Hospital (M.F.C.), and Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital, South African Medical Research Council Unit on Child and Adolescent Health, University of Cape Town (H.J.Z.), Cape Town, South Africa; Fundación INFANT (F.P.P., R.L.), Hospital Militar Central Dr. Cosme Argerich (G.P.M.), and National Scientific and Technical Research Council (R.L.), Buenos Aires; Department of Pediatric Pulmonology, Hospital del Niño Jesús, Tucumán (C.J.L.), Argentina; Departments of Pediatrics and Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX (P.A.P., F.M.M.); University of Auckland, Middlemore Hospital, Auckland, New Zealand (A.A.T.); Department of Pediatrics, University of Colorado School of Medicine, and Children's Hospital Colorado, Center for Global Health, Colorado School of Public Health, Aurora, CO (E.A.F.S.); Department of Obstetrics and Gynecology, Duke University, Durham, NC (G.K.S.); Novavax, Gaithersburg (S.A., A.A., J.C., I.C., A.F., J.S.P., V.S., D.N.T., J.W., G.M.G., L.F.F.); Department of International Health, International Center for Maternal and Newborn Health (A.H.B.), and Center for American Indian Health, Department of International Health (L.H.), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Vaccine Institute (A.C., P.T.H.) and Vascular Biology Research Centre, Molecular and Clinical Sciences Research Institute (A.K.), St. George's, University of London, London; Paediatric Infectious Diseases, Clinical and Experimental Sciences, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton (C.E.J.); Oxford Vaccine Group, Department of Paediatrics, University of Oxford and National Institute for Health Research Oxford Biomedical Research Centre (M.D.S.), and Nuffield Department of Women's and Reproductive Health, University of Oxford (M.V.), Oxford, United Kingdom; Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, WA (J.A.E.); Department of Obstetrics and Gynecology, Wayne State University, Detroit, MI (B.G.); Research Institute for Tropical Medicine, Muntinlupa, Philippines (J.N.J., M.L.); Department of Pediatrics (D.W.K.) and Division of Maternal–Fetal Medicine, Department of Obstetrics and Gynecology and Center for Women's Reproductive Health (A.T.T.), University of Alabama, Birmingham, AL; Women's and Children's Hospital and Robinson Research Institute, University of Adelaide, Adelaide, South Australia (H.S.M.); Melbourne School of Population and Global Health, University of Melbourne, and Murdoch Children's Research Institute, Parkville, Victoria (T.M.N., K.P.P.); Wesfarmers Center of Vaccines and Infectious Diseases, Telethon Kids Institute, Division of Paediatrics, School of Medicine, University of Western Australia, Perth Children's Hospital, Perth (P.C.R., T.S.), Australia; Marshfield Clinic Research Institute, Marshfield, WI (J.K.M.); Pediatría Clínica, Infectología y Traslacional Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain (F.M.-T.); Division of General Pediatrics, Department of Pediatrics, School of Medicine (J.H.S.), and Department of Obstetrics and Gynecology (M.W.V.), University of Utah Health Sciences Center, Salt Lake City, UT; Meridian Clinical Research, Norfolk, NE (K.V.); and International Center for Diarrhoeal Disease Research Bangladesh, Dhaka, Bangladesh (K.Z.)