1. Unit of Infectious Diseases, Department of Clinical and Experimental Medicine, ARNAS Garibaldi Hospital, University of Catania, I‑95123 Catania, Italy
2. U.O.C. Laboratory Analysis Unit, A.O.U. ‘Policlinico‑Vittorio Emanuele’, I‑95123 Catania, Italy
3. Unit of Infectious Diseases, Department of Clinical and Experimental Medicine, University of Messina, I‑98124 Messina, Italy
4. Unit of Infectious Diseases, Umberto I Hospital, I‑96100 Siracusa, Italy
5. Department of Biomedical and Biotechnological Sciences, University of Catania, I‑95123 Catania, Italy