the aligned sequences were calculated by the two-parameter
method of Kimura (1980). A phylogenetic tree was
constructed by the neighbour-joining method (Saitou &
Nei, 1987) with the MEGA program (version 2.1) (Kumar
et al., 2001). The confidence values of individual branches in
the phylogenetic tree were determined by using the bootstrap
analysis of Felsenstein (1985) based on 1000 samplings.
Repetitive sequence based PCR (rep-PCR) fingerprinting, as
described by Versalovic et al. (1994), was carried out with
(GTG)5 primer (59-GTGGTGGTGGTGGTG-39) (Gevers
et al., 2001) and the PCR and electrophoresis conditions
were modified from Chokesajjawatee et al. (2008).