Amplification of 16S rRNA gene was carried out with PCR reactions using 2 universal primers; 27F(50-AGAGTTTGATCTGGCTCAG-30) and1492R(50-ACGGTACCTTGT-TACGACTT-30). PCR products were purified using the QIAquick Gel Extraction Kit (Qiagen,Valencia,CAUSA).Thepurified products were sequenced with Solgent Inc.(Deajeon,ROK)using an ABI3730 XL automatic DNA sequencer. DNA sequences of 16S rDNA gene were analyzed using software from the BLASTN program