1. Division of Infectious Diseases I, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
2. Microbiology and Virology Department, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
3. Department of Medical, Surgical, Diagnostic and Pediatric Science, University of Pavia, 27100 Pavia, Italy
4. Division of Hematology, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
5. Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy