Unrooted dendrogram for 100 <i>Pseudomonas aeruginosa</i> clinical isolates.

<p>The Neighbor-Joining dendrogram was constructed using PFGE restriction patterns (<i>Spe</i> I) based on a distance generated matrix (Nei's [1972] Minimum Distance). Upper case letters (A–D) represent the four generated clades. Clustering of profiles shown in roman numerals was determined under the criterion of >80% of band match (BioImage-Whole Band Analyzer). Low case letters (a–n) represent strain subgroups. Presence (+) of virulence genes were determined by PCR and presence (+) of GEIs by hybridization with specific labeled probes. Antibiotic resistance profiles were performed by agar dilution method according to NCCLS. Symbols beside the strain number indicate isolates from the same patient.