Affiliation: | *Clinic of Infectious Diseases at University of Udine, Udine, Italy;†Sacro Cuore Hospital, Negrar, Italy;‡Amedeo di Savoia Hospital, Torino, Italy;§University of Brescia, Brescia, Italy;¶F. Fallacara Hospital, Triggiano, Italy;#Istituto Superiore di Sanità, Roma, Italy |