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Table 1 Antibiotic susceptibility profiles of the blaCTX-M ESBL-positive E. coli and K. pneumoniae.

From: Sequence analysis of genes mediating extended-spectrum beta-lactamase (ESBL) production in isolates of Enterobacteriaceae in a Lagos Teaching Hospital, Nigeria

Antibiotics MIC (μg/ml) for the blaCTX-M-positive isolates:
  E. coli   K. pneumoniae  
  (n = 18)   (n = 10)  
  MIC50 MIC90 MIC50 MIC90
Amikacin 2 16 0.5 4
Ampicillin >256 >256 >256 >256
Amoxicillin-clavulanate 6 16 8 16
Aztreonam >256 >256 >256 >256
Cefepime >256 >256 >256 >256
Cefotaxime >256 >256 >256 >256
Cefoxitin 2 12 4 12
Ceftazidime 32 >256 >256 >256
Cefuroxime >256 >256 >256 >256
Ciprofloxacin >32 >32 >32 >32
Colistin 0.002 2 0.064 1.5
Ertapenem 0.0125 0.75 0.064 0.5
Gentamicin 1 16 0.5 >256
Imipenem 0.125 0.75 0.125 0.25
Meropenem 0.094 0.125 0.047 1
Piperacillin-tazobactam 0.75 >256 0.5 >256
Tigecycline 0.5 1.5 0.125 1