Figure 3. Prevalence of resistance to multiple antimicrobial drugs in Enterococcus species by site and isolate source.

Percentage of Enterococcus isolates from bird feces (A) and environmental swabs (B) resistant to none, one or more antimicrobial drugs at a residential Control and three cattle farm sites in central Illinois. Enterococcus faecalis and Enterococcus faecium isolates were the majority of isolates with resistance to more than one antimicrobial drug for both sample types. A small number of Enterococcus hirae and Enterococcus casseliflavus isolates from environmental samples were resistant to two antimicrobial drugs.