These data demonstrate that: (1) the AMPR total E. coli are
already selected for at 16 mg/mL AMP; (2) among AMPR coliforms,
AMPR E. coli colonies are well-represented, but not CAFR E. coli; (3)
both AMPR and CAFR total coliforms and E. coli show a 2-log
decrease in OUT-BIO samples at all antibiotic concentrations; (4)
by increasing AMP concentration, the percentage of AMPR E. coli
colonies increases versus total coliforms and the percentage of bla þ
E. coli increases in OUT-BIO samples; (5) AMPR/CAFR double
resistant E. coli colonies are mostly bla þ and all of the catþ colonies
are both bla þ and catþ