Dendrogram showing PFGE profiles and corresponding STs of Pseudomonas aeruginosa strains representative of the clonal lineages. SURG.ICU, Surgical Intensive Care Unit; MED., Department of Medicine; PED., Department of Pediatrics; TRACH.ASP., tracheal aspirate; W.SW., wound swab; BRONCH.ASP., bronchial aspirate; UND., undetermined.