1. Unit of Viral Diseases and Attenuated Vaccine, Department of Infectious, Parasitic and Immune-Mediated Diseases; Istituto Superiore di Sanità; Rome Italy
2. Unit of Vector-Borne Diseases and International Health, Department of Infectious, Parasitic and Immune-Mediated Diseases; Istituto Superiore di Sanità; Rome Italy
3. Department of Life and Environment Science; University of Cagliari; Cagliari Italy