Antonio Cascio1, Chiara Iaria2. 1. Department of Human Pathology, University of Messina, Messina 98125, Italy; Associazione Italiana per la Lotta contro le Malattie Infettive (Italian Association for the Control of Infectious Diseases), University of Messina, Messina 98125, Italy. Electronic address: acascio@unime.it. 2. Infectious Diseases Unit, Azienda Ospedaliera Piemonte-Papardo, Messina, Italy; Associazione Italiana per la Lotta contro le Malattie Infettive (Italian Association for the Control of Infectious Diseases), University of Messina, Messina 98125, Italy.