Fig. 3.

Bar chart of the percentage of total isolates, at each site, resistant to the individual antibiotics tested by the disc diffusion method. The numbers in brackets indicate the total amount of purified isolates that were tested against each antibiotic for the specific site. WFS — Wonderfonteinspruit, MR — Mooi River, BC — before confluence, AC — after confluence, Ap — ampicillin (10 µg), Ax — amoxicillin (10 µg), Tt — tetracycline (30 µg), Er — erythromycin (15 µg), St — streptomycin (20 µg), Tm — trimethoprim, Cp — chloramphenicol, MAR — multiple-antibiotic resistant