FIG 1.

PFGE dendrogram illustrating the phenotypic and genotypic relationships of the strains, phylogenies, and cephalosporin resistance genes. PFGE, pulsed-field gel electrophoresis; Phylo., phylogroup; ESBL, extended-spectrum beta-lactamase gene; FQ, fluoroquinolone resistance genes; ST, sequence type; Cplx, clonal complex; U, unknown; Am, ampicillin (WT, ≤8 mg/liter); Ctx, cefotaxime (WT, ≤0.25 mg/liter); Caz, ceftazidime (WT, ≤0.5 mg/liter); Nal, nalidixic acid (WT, ≤16 mg/liter); Ci, ciprofloxacin (WT, ≤0.064 mg/liter); Gm, gentamicin (WT, ≤2 mg/liter); Sm, streptomycin (WT, ≤16 mg/liter); Km, kanamycin (WT, ≤8 mg/liter); Cm, chloramphenicol (WT, ≤16 mg/liter); Ff, florfenicol (WT, ≤16 mg/liter); Tm, trimethoprim (WT, ≤2 mg/liter); Su, sulfamethoxazole (WT, ≤64 mg/liter); Tc, tetracycline (WT, ≤8 mg/liter); Cs, colistin (WT, ≤2 mg/liter). ^a, isolates were named based on the numbers assigned to the farm (F), flock (F), and fly (M).