1. Unit of Infectious Diseases, Department of Medical Sciences, University of Turin, “Amedeo di Savoia” Hospital, ASL “Città di Torino”, 10060 Turin, Italy
2. Unit of Infectious Diseases, Cardinal Massaia Hospital, 14100 Asti, Italy
3. Microbiology and Molecular Biology Laboratory, “Amedeo di Savoia” Hospital, ASL “Città di Torino”, 10060 Turin, Italy
4. Unit of Oncology and Haematology, Candiolo Cancer Institute, FPO-IRCCS, 10060 Candiolo, Italy
5. Department of Medical Sciences, Infectious Diseases, University of Turin, 10126 Turin, Italy