FIG. 1.

PFGE fingerprint patterns and genetic similarity dendrogram of H. influenzae clinical isolates. Lane 1, BB1051; lane 2, BB1050; lane 3, BB1054; lane 4, BB1052; lane 5, BB1053; lane 6, BB1056; lane 7, BB1055; lane M, molecular size marker. Numbers above the bands are molecular sizes (in kilobases). PFGE patterns with coefficients of similarity greater than 85% were considered to define a particular clone. Three ampicillin-susceptible clinical H. influenzae strains of serotype e (BB1054 to BB1056), isolated from three different hospitals in Spain in the same year as BB1053, were included for comparison (Table 1).