University of Florence - Immunology Unit, University of Florence - Immunology Unit, University of Genova - Department of Health Sciences, University of Padua - Department of Cardiac, Thoracic, Vascular Sciences and Public Health, A.O.U. City of Health and Science - S.C. Microbiology and virology laboratory, A.O.U. City of Health and Science - S.C. Microbiology and virology laboratory, - Department of Health Promotion, Maternal-Infantile, Internal and Specialized Medicine of Excellence “G. D'Alessandro, University of Padua - Department of Woman’s and Child’s Health, Regional epidemiology reference service for the surveillance, prevention and control of infectious diseases- Local Health Unit of Alessandria, University of Foggia - Department of Medical and Surgical Sciences, University of Florence - Immunology Unit, University of Genova - Department of Health Sciences, University of Foggia - Department of Medical and Surgical Sciences, University of Florence - Laboratory of Immunology and Molecular Microbiology, University of Foggia - Department of Medical and Surgical Sciences, University of Florence - Immunology Unit, Regional Directorate of Prevention, Food Safety, Veterinary, Public Health-Veneto Region, Padua University and Hospital - Women and Child Health Department, - Department of Health Promotion, Maternal-Infantile, Internal and Specialized Medicine of Excellence “G. D'Alessandro, Government of the United Kingdom - National Infection Service, University of Florence - Immunology Unit and Independent

Government of the United Kingdom - Public Health England Colindale, UK Health Security Agency, UK Health Security Agency, UK Health Security Agency, Government of the United Kingdom - Office for National Statistics, Government of the United Kingdom - Office for National Statistics, Government of the United Kingdom - Office for National Statistics, London School of Hygiene and Tropical Medicine, London School of Hygiene and Tropical Medicine and Government of the United Kingdom - National Infection Service