Table 2.

MICs of selected β-lactams for host strain E. coli XL-1 Blue MRF′ [pBC SK(+)] and clones containing the recombinant phagemids pARL98-1 and pARL98-2

AntibioticMIC (μg/ml) for:
pBC SK(+)pARL98-1 (blaB2)pARL98-2 (blaB3)
Imipenem0.1250.1250.25
Meropenem0.0120.0120.016
Ampicillin416>256
Piperacillin112
Aztreonam0.250.250.25
Cefoxitin161616
Cefpirome0.1250.1250.125
Ceftazidime0.250.250.5