TABLE 1.

Antimicrobial susceptibility patterns of S. marcescens, K. pneumoniae, and E. coli isolates and their E. coli transconjugants

Antimicrobial agent(s)MIC (μg/ml)
S. marcescens S1 to S21K. pneumoniaeE. coli E1E. coli EC600E. coli transconjugants
K1 to K9K10
Imipenem4-82-41282≤0.1251-2
Meropenem2-44-82562≤0.1252
Ertapenem4-88>2568≤0.1254
Ampicillin>256>256>256>2568>256
Piperacillin256>256>256>2561256
Piperacillin-tazobactam128-256256->256>2562561256
Ceftriaxone32256>256>256≤0.12532
Ceftazidime8-1664-128256640.2516-32
Cefotaxime16-32128256256≤0.1258
Cefepime8-1632-6425664≤0.1258
Cefoperazone-sulbactam32-64128-256>256128≤0.12532
Cefoxitin16-328-1625632816
Aztreonam128-256256>256256≤0.125128
Ciprofloxacin≤0.12516->32>32>32≤0.125≤0.125
Gentamicin0.5-1>256>256640.250.25