1. IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
2. Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy
3. Microbiology and Virology Unit, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
4. Specialization School of Microbiology and Virology, University of Pavia, Italy