Each bacterial isolate was grown in MRS broth at 30oC for 16-18 h. The bacterial cell pellet was collected by centrifugation. The whole cell DNA extraction was conducted as described by Chomczynski and Rymaszewski (1). In brief, 10 μl of the cell pellet was suspended in 0.2 ml alkaline-polyethylene glycol (alk- PEG) solution, boiled at 100oC for 10 min and centrifuged to discard the cell debris. The clear lysate was used as template for the fingerprint analysis.