Amplification of the 16S rRNA gene was performed using
the primers of An et al. (2006). The pheS and rpoA genes
were amplified using the primers of De Bruyne et al.(2007)
and the protocols of Naseret al.(2005). The dnaK gene was
amplified using the primers and protocol of Huang et al.
(2010). Purification and sequencing of PCR products were
carried out by the Shenggong Company in Shanghai, China.
The resulting sequences, together with those of related
strains obtained from the GenBank database were aligned by
using CLUSTAL W. A phylogenetic tree was reconstructed