SplitsTree showing the distribution of all of the sequence types obtained for the clinical Pseudomonas aeruginosa isolates studied. The SplitsTree was based on the analysis of the allelic profiles of the acsA, aroE, guaA, mutL, nuoD, ppsA and trpE genes. The MDR isolates are labelled in bold and the XDR isolates are indicated in bold and underlined. The sequence types represented by more than one isolate are indicated in italic font. Asterisk mark (*) indicates the new sequence types described in this study.