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), Bambino Gesù Children's Hospital, Instituto de Investigación 12 de Octubre (imas12) - Pediatric Infectious Diseases Unit, University of Padua, Universidad Europea de Madrid - Paediatrics Research Group, Columbia University - Irving Medical Center, Stellenbosch University - Children’s Infectious Diseases Clinical Research Unit (KID-CRU), University of the Witwatersrand, University of Padova, Fundação Ariel Glaser contra o SIDA Pediatrico, Stellenbosch University - Family Centre for Research with Ubuntu, University College London Hospitals NHS Foundation Trust - Advanced Pathogen Diagnostics Unit, University of Barcelona - Institut de Salut Global de Barcelona (ISGlobal), University of Barcelona - Institut de Salut Global de Barcelona (ISGlobal), Centro de Investigação em Saúde da Manhiça (CISM), Centre Hospitalier Universitaire Gabriel Touré, University of Sciences, Technique and Technologies of Bamako (USTTB), Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), University Hospital 12 de Octubre, University of Padua - Department of Women’s and Children’s Health, Ragon Institute of MGH, MIT and Harvard, University of the Witwatersrand - Perinatal HIV Research Unit, Africa Health Research Institute, Africa Health Research Institute, Africa Health Research Institute, University of Miami - Miami Center for AIDS Research, University of Miami - Miami Center for AIDS Research, Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO), Bambino Gesù Children's Hospital - Academic Department of Pediatrics (DPUO) and Independent