Table 1.

Antimicrobial susceptibilities of clinical isolates, transconjugants, and control strains

AntimicrobialMIC (μg/ml) for strain or transconjugant:
C. freundii2524/96C. freundii 2525/96C. freundii2526/96E. coli 2527/96R+ [C. freundii 2524]R+ [C. freundii2525]R+ [C. freundii2526]R+ [E. coli 2527]E. coli A15 RC. freundii 870/97 (wild type)
Ampicillin>512>512>512>512>512>512>512>512232
Piperacillin>512>512>512>512256256256>5120.52
Piperacillin-tazobactam888160.50.50.510.52
Cefotaxime>512>512>512>512323232512≤0.030.13
Cefotaxime-clavulanate0.50.50.50.5≤0.03≤0.03≤0.030.06≤0.03 NDa
Cefotaxime-tazobactam0.50.50.50.5≤0.03≤0.03≤0.03≤0.03≤0.03ND
Ceftazidime444160.50.50.540.060.5
Ceftazidime-clavulanate11120.060.060.060.250.06ND
Ceftazidime-tazobactam11120.130.130.130.25≤0.03ND
Aztreonam323232128222160.060.06
Aztreonam-clavulanate0.250.250.250.25≤0.03≤0.03≤0.030.06≤0.03ND
Aztreonam-tazobactam0.250.250.250.5≤0.03≤0.03≤0.03≤0.03≤0.03ND
Cefoxitin1281281281622222128
Imipenem0.130.130.130.130.250.250.250.250.250.25
Gentamicin>256>256>256>256>256>256>256>2560.13ND
Tobramycin>256>256>256>256256256256>2560.25ND
  • a ND, not determined.