Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), Instituto de Investigación 12 de Octubre (imas12) - Pediatric Infectious Diseases Unit, University of Miami - Department of Microbiology and Immunology, Universidad Europea de Madrid - Paediatrics Research Group, Instituto de Investigación 12 de Octubre (imas12) - Pediatric Infectious Diseases Unit, Imperial College London - Department of Paedaitric Infectious Diseases, University College London - MRC Clinical Trials Unit, Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), University College London Hospitals NHS Foundation Trust - Advanced Pathogen Diagnostics Unit, University College London - Department of Infection, Inflammation and Immunity, Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), Boston Children's Hospital - Precision Vaccines Program, Boston Children's Hospital - Precision Vaccines Program, Boston Children's Hospital - Precision Vaccines Program, University of Massachusetts Worcester - Program in Molecular Medicine, Boston Children's Hospital - Precision Vaccines Program, University of Padua - Department of Women’s and Children’s Health, University of Oxford - Department of Paediatrics, Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), Boston Children's Hospital - Precision Vaccines Program, University of Miami - Department of Microbiology and Immunology, Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO) and affiliation not provided to SSRN