Corresponding Author

C. Foschi

Microbiology, DIMES, University of Bologna, via Massarenti 9, Bologna, Italy

Corresponding author

Claudio Foschi, Microbiology, DIMES, University of Bologna, St. Orsola-Malpighi Hospital, Via Massarenti, 9, 40138 Bologna, Italy. Tel: +39 051 2144513; Fax: +39 051 307397

e-mail: claudio.foschi2@unibo.it