FIG 1.

Neighbor-joining tree of 1,015 isolates, housekeeping genes, and concatenated sequences (topology graph). Besides three pathogenic Yersinia species, Y. similis and the Korean group are colored according to the description by Laukkanen-Ninios et al. (19). **, ST187 was the only sequence type shared by pathogenic and nonpathogenic Y. enterocolitica strains. The nonpathogenic strain was a biotype 1A ail⁺ strain. *, Two particular nonpathogenic, ystB⁺ Y. enterocolitica strains, ST184, clustered next to ystB-negative strain STs (ST181 to ST183), and ST185, a biotype 1A ail⁺ strain, clustering next to pathogenic Y. enterocolitica STs, indicating its potential pathogenicity. s.s., sensu stricto.