Features of E. coli strains harbouring integron-IS26 elements.

AThe genetic structure of the integron-dfrA5-IS26 element and flanking regions of E. coli strain D22 is illustrated in Figure 2.BModerate level of resistance. Resistance to antibiotics is indicated by (+) and susceptibility is indicated by (−). Abbreviations of antibiotics: A, ampicillin (32 µg/ml); S, streptomycin (25 µg/ml); T, tetracycline (20 µg/ml); C, chloramphenicol (10 µg/ml); Su, sulfathiazole (550 µg/ml); Tm, trimethoprim (50 µg/ml); K, kanamycin (10 µg/ml); Na, nalidixic acid (50 µg/ml); Sp, spectinomycin (50 µg/ml); G, gentamicin (2.5 µg/ml); and Cp, ciprofloxacin (2 µg/ml). The source of E. coli strains is indicated by B, Bovine or H, human. The location of cattle properties is indicated by P1, Kameruka; P2, Cowra; P3, Eden; P4, Dungog; P5, Finley; P6, Gerringong; P7, Bega; P8, Canowindra and P9, Richmond. Human-derived E. coli strains were sourced from the Melbourne Diagnostic Unit (MDU) from patients with bloody diarrhoea (BD) or urinary tract infections (UTI).