C Foschi1, D Lombardo2, P Gaibani2, M C Re2, S Ambretti2. 1. Unit of Microbiology, Department of Specialistic, Diagnostic and Experimental Medicine, St. Orsola-Malpighi University Hospital, Bologna, Italy. Electronic address: claudio.foschi2@unibo.it. 2. Unit of Microbiology, Department of Specialistic, Diagnostic and Experimental Medicine, St. Orsola-Malpighi University Hospital, Bologna, Italy.