Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Microbiology and Virology Unit, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.

Department of Hematology, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.

Microbiology and Virology Unit, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Infectious and Tropical Diseases Unit, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Microbiology and Virology Unit, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Department of Hematology, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Infectious and Tropical Diseases Unit, Careggi University Hospital, Florence, Italy.

Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy; Infectious and Tropical Diseases Unit, Careggi University Hospital, Florence, Italy. Electronic address: michele.spinicci@unifi.it.