Fig. 1.

—Phylogenic tree of the 185 Pseudomonas aeruginosa strains. The unrooted phylogeny of all P. aeruginosa strains was based on the maximum-likelihood method using PhyML 3.0 (Guindon et al. 2010). Each sequence type with more than one isolate [i.e. ST27 (n = 2), ST111 (n = 3), ST235 (n = 136), ST244 (n = 3), ST274 (n = 2), ST277 (n = 5), ST357 (n = 11), ST966 (n = 4), ST1284 (n = 2), and ST1342 (n = 4)] is indicated in color. Scale bar: 0.04 substitutions per variable site. Each main branch had >99% bootstrap support.