Fig. 1.— Pulsed-field gel electrophoresis (PFGE) pattern of the Burkholderia cepacia complex isolates in the 12 patients as indicated by their number in table 1⇑ in 1999. Different PFGE banding patterns are numbered sequentially. Types III' and IV' differ in 4 and 3 fragments, respectively, from the types III and IV banding patterns. Patients 4, 8 and 5 were included in the 1993 study and were identified as having PFGE type IV', VI and VIII respectively. For patient 4, the 1993 isolate with IV' banding pattern is also shown which differs slightly from type IV. For patients 5 and 8, the PFGE pattern of the strain was identical in 1993 and 1999. Number of samples: patient 1, n=5; patient 2, n=6; patient 3, n=2; patient 4, n=2; patient 5, n=2; patient 6, n=3; patient 7, n=1; patient 8, n=8; patient 9, n=4; patient 10, n=2; patient 11, n=1; patient 12, n=8.