1. Microbiology and Virology Unit, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
2. General Clinical Laboratory, with Specialist Areas of Clinical Pathology, Microbiology and Virology, Istituti Clinici Scientifici Maugeri IRCCS, 27100 Pavia, Italy
3. Obstetrics and Gynecology, Fondazione IRCCS Policlinico San Matteo, 27100 Pavia, Italy
4. Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy