1. Department of Life Sciences, University of Trieste, Trieste, Italy.
2. Microbiology Unit, University Hospital of Trieste, Trieste, Italy.
3. Infectious Diseases Unit, University Hospital of Trieste, Trieste, Italy.
4. Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania, Catania, Italy.
5. Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy.