1. Department of Infectious, Parasitic and Immune-Mediated Diseases; Istituto Superiore di Sanità; Rome; Italy
2. Department of Experimental Medicine and Pathology; Istituto Pasteur-Fondazione Cenci-Bolognetti; La Sapienza University; Rome; Italy
3. National Institute for Infectious Disease IRCCS ‘L. Spallanzani’; Rome; Italy