1. Infectious Disease Unit, Department of Clinical and Experimental Medicine, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Pisa, Italy
2. National Center for Drug Research and Evaluation, Istituto Superiore di Sanità, Rome, Italy
3. Department of Neuroscience, Istituto Superiore di Sanità, Rome, Italy
4. Infectious and Tropical Diseases Unit, Florence Department of Medicine, Careggi University Hospital, Florence, Italy
5. Clinic of Infectious Diseases, “Santa Maria della Misericordia” Hospital, University of Perugia, Perugia, Italy
6. Infectious Disease Unit, Hospital of Lucca, Lucca, Italy
7. Infectious Diseases, Ospedale S. Maria Annunziata, Firenze, Italy
8. University of Milano-Bicocca School of Medicine, Milan, Italy
9. Azienda socio sanitaria territorial (ASST) Grande Ospedale Metropolitano Niguarda, Milan, Italy
10. Research Coordination and Support Service (CoRi), Istituto Superiore di Sanità, Rome, Italy
11. Italian National Blood Centre, Rome, Italy
12. Unit of Infectious Diseases, Carlo Poma Hospital, Mantova, Italy
13. Internal Medicine, Unità Sanitaria Locale (USL)–Umbria 1, Ospedale Città di Castello, Città di Castello, Italy
14. Infectious Diseases Unit, San Giuseppe Hospital, Azienda USL Toscana Centro, Empoli, Italy
15. Centro Regionale Sangue, Servizio Immunotrasfusionale, Azienda Ospedaliera di Perugia, Perugia, Italy
16. Internal Medicine, Ospedale Unico della Versilia, Lido di Camaiore, Italy
17. Infectious Diseases Unit, Department of Health Sciences, ASST Santi Paolo e Carlo University Hospital, Milan, Italy
18. Internal Medicine, Ospedale di Foligno, Foligno, Italy
19. Infectious Diseases, Azienda Ospedaliera di Lecco, Lecco, Italy
20. Infectious Diseases, Ospedale San Jacopo, Pistoia, Italy
21. Cell Therapy and Transfusion Medicine, Careggi University Hospital, Florence, Italy
22. Azienda Ospedaliera Universitaria, Ospedali Riuniti di Ancona, Ancona, Italy
23. Division of Infectious Diseases, Arezzo Hospital, Arezzo, Italy
24. Department of Infectious Diseases, ASST Monza, University of Milano-Bicocca, Milan, Italy
25. Infectious Disease Unit, Azienda USL–Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) di Reggio Emilia, Reggio Emilia, Italy
26. Infectious Diseases, Livorno Hospital, Livorno, Italy
27. Division of Infectious Diseases, Bari University Hospital, Bari, Italy
28. Infectious Diseases, IRCCS Ospedale San Raffaele, Università Vita-Salute San Raffaele, Milan, Italy
29. Department of Experimental and Clinical Medicine, University of Foggia, Foggia, Italy
30. North-Western Tuscany Blood Bank, Pisa University Hospital, Pisa, Italy
31. Division of Transfusion Medicine and Transplant Biology, Pisa University Hospital, Pisa, Italy
32. Division of Virology, University Hospital of Pisa, Retrovirus Center, Department of Translational Research, University of Pisa, Pisa, Italy
33. for the TSUNAMI Study group