1. These authors have contributed equally
2. Specialization School of Microbiology and Virology, University of Pavia, Pavia, Italy
3. Microbiology and Virology Unit, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy
4. Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy
5. ASST Pavia, Ospedale Civile di Voghera, Voghera, Italy
6. ASST Pavia, Ospedale Unificato Broni-Stradella, Internal Medicine Unit, Stradella, Italy
7. These authors contributed equally to the work and share the last authorship