Nanjing Medical University, Nanjing Medical University - School of Public Health, Government of the United States of America - Centers for Disease Control and Prevention (CDC), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC) - Consejo Nacional de Investigaciones Científicas y Técnicas, World Health Organization (WHO) - Department of Immunization, Vaccines and Biologicals (IVB), Boston University - Department of Global Health, Chris Hani Baragwanath Academic Hospital - Vaccines and Infectious Diseases Analytics Research Unit, Yale University - Institute for Global Health, University of Colorado at Denver - Department of Pediatrics, University of Edinburgh - College of Medicine & Veterinary Medicine, affiliation not provided to SSRN, National Center for Communicable Diseases, University of Barcelona - Institut de Salut Global de Barcelona (ISGlobal), Hospices Civils de Lyon - Laboratoire de Virologie, NCDC, University of Melbourne - Infection and Immunity, Smorodintsev Research Institute of Influenza, University of Melbourne - Infection and Immunity, affiliation not provided to SSRN, Hospital de Niños R. Gutiérrez, University of Michigan at Ann Arbor - Department of Epidemiology, University of Turku - Department of Pediatrics, National Centre for Biosecurity and Infectious Disease (NCBID) - Institute of Environmental Science and Research Limited (ESR), affiliation not provided to SSRN, All India Institute of Medical Sciences (AIIMS), New Delhi, affiliation not provided to SSRN, University of Split, FISABIO-Public Health, Perth Children’s Hospital - Telethon Kids Institute, National Health Laboratory Services (NHLS) - Centre for Respiratory Diseases and Meningitis, affiliation not provided to SSRN, University of Warwick, affiliation not provided to SSRN, affiliation not provided to SSRN, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), affiliation not provided to SSRN, Tehran University of Medical Sciences, MAHAN Trust Mahatma Gandhi Tribal Hospital, affiliation not provided to SSRN, Hospital de Santa Maria, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of the Witwatersrand - Department of Clinical Microbiology and Infectious Diseases, affiliation not provided to SSRN, Nagasaki University - Department of Pediatric Infectious Diseases, Nanyang Technological University (NTU) - Lee Kong Chian School of Medicine, University of Cape Town (UCT) - Department of Pediatrics and Child Health, affiliation not provided to SSRN, University of Edinburgh - College of Medicine & Veterinary Medicine and affiliation not provided to SSRN

University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, University of Southern California - Division of Infectious Diseases, Children’s Hospital Los Angeles - Department of Pathology and Laboratory Medicine, University of Michigan at Ann Arbor - Department of Epidemiology, St. Jude Children’s Research Hospital - Department of Immunology, St. Jude Children’s Research Hospital - Department of Immunology and University of Southern California - Division of Infectious Diseases

University of Wisconsin - Madison - Influenza Research Institute, University of Wisconsin-Madison - Influenza Research Institute, University of Wisconsin-Madison - Influenza Research Institute, University of Wisconsin Hospital and Clinics - UW Health Clinical Laboratories, University of Michigan at Ann Arbor - Department of Pathology, University of Michigan at Ann Arbor - Department of Epidemiology, University of Wisconsin-Madison - University of Wisconsin Hospital and Clinics, University of Michigan at Ann Arbor - Department of Epidemiology and University of Wisconsin-Madison - Influenza Research Institute