Figure 3. A neighbor joining tree showing the phylogenetic relationships of the Salmonella Typhimurium STs included in this study (n = 47).

All STs were delineated into five major groups (bootstrap ≥70). The STs from Asia were labeled with a black dot in the phylogenetic tree, whereas STs from Guangdong were labeled GD. The percentages of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replications) are indicated. The evolutionary distances were computed using the neighbor joining method and are presented in units of the number of base substitutions per site.