Department of Health Sciences (DISSAL), University of Genoa, Clinica Malattie Infettive, San Martino Policlinico Hospital-IRCCS for Oncology and Neurosciences, Clinical Department of Medical, Surgical and Health Sciences, University of Trieste, Infectious Diseases Unit, Trieste University Hospital, Laboratorio di Riferimento per SARS-CoV-2, Regione Friuli-Venezia Giulia, Azienda Sanitaria Universitaria Integrata Giuliano-Isontina (ASUGI), UCO Igiene e Sanità Pubblica, Department of Perioperative Medicine, Intensive Care and Emergency, Cattinara Hospital, Trieste University, Clinical Pathology and Microbiology Unit, "San Giovanni di Dio" Hospital, Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Anaesthesia and Intensive Care, San Martino Policlinico Hospital-IRCCS for Oncology and Neurosciences, Department of Medicine, University of Barcelona, Hygiene Unit, San Martino Policlinico Hospital-IRCCS for Oncology and Neurosciences