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

University of Padua, affiliation not provided to SSRN, affiliation not provided to SSRN, Regional Directorate of Prevention, Food Safety, Veterinary, Public Health-Veneto Region, University of Verona, London School of Hygiene & Tropical Medicine and University of Padua

University of Verona - Division of Infectious Diseases, University of Verona, University of Verona, University of Verona, University of Verona, University of Verona, University of Verona, University of Verona, Regional Directorate of Prevention, Food Safety, Veterinary, Public Health-Veneto Region, University of Verona, University of Verona, University of Verona, University of Verona and University of Verona