Table 1.

MICs of β-lactam antibiotics for the clinical isolate Kox 443, its transconjugant Tc 443, and otherE. coli strains

StrainPlasmid-mediated enzymeMIC (μg/ml) ofa:
AMAM + SUL8AMXAMX + CA2TICTIC + CA2PIPPIP + TZ4CF
K. oxytoca443TEM-59/IRT-1764162561283286484
E. coli Tc 443TEM-59/IRT-17128645125126464128168
E. coliK-12TEM-2>1,0241,024>1,02464>1,024128256132
E. coliK-12None424442118
  • a AM, ampicillin; AMX, amoxicillin; TIC, ticarcillin; PIP, piperacillin; CF, cephalothin; SUL8, sulbactam at 8 μg/ml; CA2, clavulanic acid (2 μg/ml); TZ4, tazobactam (4 μg/ml).