1. Department of Infectious Diseases, Galliera Hospital, Genoa, Italy.
2. Department of Pathology, ASL 1 Imperiese, Sanremo, Italy.
3. Department of Microbiology, ASL 1 Imperiese, Sanremo, Italy.
4. Department of Infectious Diseases, IRCCS Sann Martino-IST, Genoa, Italy.
5. Department of Health Sciences, University of Genoa, Genoa, Italy.