1 Vita-Salute San Raffaele University, Milan, Italy raccagni.angelo@hsr.it.
2 Emerging Bacterial Pathogens Unit, Division of Immunology, Transplantation, and Infectious Diseases, IRCCS San Raffaele Scientific Institute, Milan, Italy.
3 Vita-Salute San Raffaele University, Milan, Italy.
4 Infectious Diseases Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.