Table 1.

In vitro β-lactam susceptibilities of K. oxytoca 1731 and K. pneumoniae 1734 and their transconjugants and the E. coli J53-2 recipient

β-LactamMIC ( μg/ml) for:
K. oxytoca 1731E. coli J53-2 R+ (EC1731)K. pneumoniae 1734E. coli J53-2 R+ (EC1734)E. coli J53-2 R
Amoxicillin1,0241,0241,0241,0242
 + Clavulanate323232322
Ticarcillin≥1,024≥1,024≥1,024≥1,0242
 + Clavulanate323232322
Cefoxitin646464644
 + Clavulanate646464644
Cefotaxime1111≤0.06
 + Clavulanate1111≤0.06
Ceftazidime161616160.25
 + Clavulanate161616160.25
Aztreonam4141≤0.06
 + Clavulanate4121≤0.06
Cefepime0.12≤0.060.12≤0.06≤0.06
 + Clavulanate≤0.06≤0.060.12≤0.06≤0.06
Imipenem0.120.120.120.120.12