Figure 2. Prevalence of resistance to one or more antimicrobial drugs by site, bacterial genus, and isolate source.

Percentage of Escherichia coli (A and C) and Enterococcus (B and D) isolates resistant to none, one, or more antimicrobial drugs at a residential control and three cattle farm sites in central Illinois by sample source. Escherichia coli resistant to more than one antimicrobial drug were primarily found in bird and environmental samples from the Dairy site. In contrast, Enterococcus isolates were seen in both sample types at all three farm facilities but less commonly at the Control.