Bioserotype Location Source 52203 4/O:3 The Pasteur Institute, France Purchased from the Pasteur Institute by the Institute of Chinese Biomedicine. 52212 4/O:9     52211 1B/O:8     Pa40134 4/O:3 Japan Provided by Dr. H. Fukushima (Public Health Institute of Shimane Prefecture, Matsue, Japan). ye3vp-/03 3/O:3     ye3vp5/03

click here 3/O:3     ye4/03 4/O:3     D92 2/O:5,27     Pa12986 1B/O:8     Ye92010 1BO:8     8081 1B/O:8 Complete genome sequence of the highly pathogenic Yersinia enterocolitica subsp. enterocolitica 8081 (Genbank: NC_008800). Primer nucleotide sequences The primers for ail and foxA were designed in our laboratory, referencing sequences from GenBank (ail: M29945, foxA: X60447), and synthesized by Shanghai Sangon Biological Engineering & Technology and Service Co., Ltd, China. The primers for ail amplify the entire ORF, while those for foxA amplify the ORF coding region from nt 28 to nt 1,461 (Table 3). Table 3 Primer sequences and annealing temperatures

for ail and foxA. Target gene and primer direction Primer Sequences (5′→ 3′) GenBank no. Location (nt) Amplicon length Annealing temp. ail Forward GGT TAT TGT ATT AGT ATT DNA Damage inhibitor GTT M29945 AZD8186 446-466 585 bp 57°C   Reverse CAG GTG GGT TTT CAC TAT CTG   1031-1051     foxA Forward CTC TGC GGA AGA TAA CTA TG X60447 389-408 1532 bp 58°C   Reverse ATC CGG GAA TAA ACT TGG CGT A

  1899-1920     PCR, DNA sequencing and sequence analysis Bacteria were cultured as previously described [18]. The bacterial DNA was extracted using a Blood & Tissue Kit (QIAGEN, USA). PCR was performed in a 200 μl volume containing 10 ng DNA template, 5U Taq DNA polymerase (TaKaRa, China), 0.2 mM of each dNTP, 1 μM of each forward and reverse primer, 1.5 mM MgCl2, 50 mM KCl, and 10 mM Tris-HCl (pH 8.3). Thermal cycling was done in a MJ PTC200 (Bio-Rad, USA) and the conditions were: one cycle of denaturation at 94°C for 5 min, followed by 25 cycles of melting at 94°C for 15 s, annealing for 30 s at various temperatures depending on the primers used (Table 3), elongation at 72°C for 30 s, and a final extension at 72°C for 10 min. Five microliters of PCR product was electrophoresed on a 1.5% agarose gel. The gel image was captured using a Gel Documentation 2000 (Bio-Rad, USA).