Department of Public Health and Infectious Diseases, University of Rome "Sapienza", Rome, Italy. Infectious Diseases Clinic, Azienda Policlinico Umberto I, Rome, Italy. Emergency Department, Royal Infirmary of Edinburgh, EMERGE - Emergency Medicine Research Group Edinburgh, Edinburgh, UK. Department of Experimental Medicine, University of Rome "Sapienza", Rome, Italy. Unit of Clinical Immunology, Azienda Ospedaliera San Giovanni-Addolorata, Rome, Italy. Department of Translational and Precision Medicine, University of Rome "Sapienza", Rome, Italy.