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Hammitt LL, Dagan R, Yuan Y, Baca Cots M, Bosheva M, Madhi SA, Muller WJ, Zar HJ, Brooks D, Grenham A, Wählby Hamrén U, Mankad VS, Ren P, Takas T, Abram ME, Leach A, Griffin MP, Villafana T. Nirsevimab for Prevention of RSV in Healthy Late-Preterm and Term Infants. N Engl J Med 2022; 386:837-846. [PMID: 35235726 DOI: 10.1056/nejmoa2110275] [Citation(s) in RCA: 523] [Impact Index Per Article: 174.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Respiratory syncytial virus (RSV) is a major cause of lower respiratory tract infection and hospitalization in infants. Nirsevimab is a monoclonal antibody to the RSV fusion protein that has an extended half-life. The efficacy and safety of nirsevimab in healthy late-preterm and term infants are uncertain. METHODS We randomly assigned, in a 2:1 ratio, infants who had been born at a gestational age of at least 35 weeks to receive a single intramuscular injection of nirsevimab or placebo before the start of an RSV season. The primary efficacy end point was medically attended RSV-associated lower respiratory tract infection through 150 days after the injection. The secondary efficacy end point was hospitalization for RSV-associated lower respiratory tract infection through 150 days after the injection. RESULTS A total of 1490 infants underwent randomization: 994 were assigned to the nirsevimab group and 496 to the placebo group. Medically attended RSV-associated lower respiratory tract infection occurred in 12 infants (1.2%) in the nirsevimab group and in 25 infants (5.0%) in the placebo group; these findings correspond to an efficacy of 74.5% (95% confidence interval [CI], 49.6 to 87.1; P<0.001) for nirsevimab. Hospitalization for RSV-associated lower respiratory tract infection occurred in 6 infants (0.6%) in the nirsevimab group and in 8 infants (1.6%) in the placebo group (efficacy, 62.1%; 95% CI, -8.6 to 86.8; P = 0.07). Among infants with data available to day 361, antidrug antibodies after baseline were detected in 58 of 951 (6.1%) in the nirsevimab group and in 5 of 473 (1.1%) in the placebo group. Serious adverse events were reported in 67 of 987 infants (6.8%) who received nirsevimab and in 36 of 491 infants (7.3%) who received placebo. CONCLUSIONS A single injection of nirsevimab administered before the RSV season protected healthy late-preterm and term infants from medically attended RSV-associated lower respiratory tract infection. (Funded by MedImmune/AstraZeneca and Sanofi; MELODY ClinicalTrials.gov number, NCT03979313.).
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MESH Headings
- Antibodies, Monoclonal, Humanized/administration & dosage
- Antibodies, Monoclonal, Humanized/adverse effects
- Antibodies, Monoclonal, Humanized/therapeutic use
- Antiviral Agents/administration & dosage
- Antiviral Agents/adverse effects
- Antiviral Agents/therapeutic use
- Drug Administration Schedule
- Female
- Humans
- Infant
- Infant, Newborn
- Infant, Premature
- Infant, Premature, Diseases/prevention & control
- Injections, Intramuscular
- Kaplan-Meier Estimate
- Male
- Respiratory Syncytial Virus Infections/prevention & control
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Affiliation(s)
- Laura L Hammitt
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Ron Dagan
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Yuan Yuan
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Manuel Baca Cots
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Miroslava Bosheva
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Shabir A Madhi
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - William J Muller
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Heather J Zar
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Dennis Brooks
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Amy Grenham
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Ulrika Wählby Hamrén
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Vaishali S Mankad
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Pin Ren
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Therese Takas
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Michael E Abram
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Amanda Leach
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - M Pamela Griffin
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
| | - Tonya Villafana
- From the Department of International Health, Johns Hopkins University, Baltimore (L.L.H.), and AstraZeneca, Gaithersburg (Y.Y., D.B., A.G., P.R., T.T., M.E.A., A.L., M.P.G., T.V.) - both in Maryland; the Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel (R.D.); Quirónsalud Málaga Hospital, Malaga, Spain (M.B.C.); University Multiprofile Hospital for Active Treatment, St. George Medical University, Plovdiv, Bulgaria (M.B.); the South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit and African Leadership in Vaccinology Expertise, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg (S.A.M.), and the Department of Paediatrics and Child Health, Red Cross Children's Hospital, and the Medical Research Council Unit on Child and Adolescent Health, University of Cape Town, Cape Town (H.J.Z.) - all in South Africa; Ann and Robert H. Lurie Children's Hospital of Chicago and Northwestern University Feinberg School of Medicine, Chicago (W.J.M.); AstraZeneca, Gothenburg, Sweden (U.W.H.); and AstraZeneca, Durham, NC (V.S.M.)
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