1. Institutes of Microbiology, Agostino Gemelli Hospital, Catholic University of the Sacred Heart, Rome, Italy
2. Section of Microbiology, Department of Biotechnologies, University of Siena
3. Infectious Diseases, Agostino Gemelli Hospital, Catholic University of the Sacred Heart, Rome, Italy
4. Clinical Microbiology and Virology Unit, Siena University Hospital, Siena, Italy