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Table 1 MIC(μg/ml) breakpoints of susceptibility for each type of bacteria

From: Comparative antimicrobial susceptibility of aerobic and facultative bacteria from community-acquired bacteremia to ertapenem in Taiwan

MIC Breakpoint of Susceptibility (μg/ml)
Type of bacteria /Antibiotic FEP FOX CAZ CRO ERT PIP TAZO CIP AN GM
Staphylococci 8 8 8 8 2 16 8/4 1 16 4
Streptococci 1 8 8 8 1   8/4 1   
Enterococci 8     **   8/4 1   
Enterobacteriaceae 8 8 8 8 2 16 16/4 1 16 4
Non-fermenters 8 8 8 8 2 16 16/4* 1 16 4
  1. FEP = cefepime, FOX = cefoxitin, CAZ = ceftazidime, CRO = ceftriaxone, ERT = ertapenem, PIP = piperacillin, TAZO = piperacillin-tazobactam, CIP = ciprofloxacin, AN = amikacin GM = gentamicin, MIC = minimal inhibitory concentrations, ≤ indicates less than or equal to.
  2. * For P. aeruginosa, MIC susceptibility breakpoint of piperacillin-tazobactam is 64/4 μg/ml.
  3. ** There are no proposed breakpoints for ertapenem against enterococci. In this present study, 2 μg/ml was used as breakpoint for ertapenem against enterococci.