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Table 1 Results of MIC of test isolates against carbapenems (Interpreted as per CLSI guidelines 2017)

From: AcrAB-TolC efflux pump system plays a role in carbapenem non-susceptibility in Escherichia coli

Antibiotics MIC range examined (μg ml− 1) No. (%) of isolates above the breakpoint (N = 35)
< 0.25 0.25 0.5 1 2 4 8 16 32 64 128 256 512 >  512
Meropenem 12 2 1 1 1 4 2 6 1 1 4 60 (n = 21)
Ertapenem 4 1 5 1 3 3 6 3 5 2 3 88.6(n = 31)
Imipenem 8 1 7 7 3 3 3 4 3 2 1 1 77 (n = 27)
  1. N Total number of isolates, n Total number of isolates above the break point
  2. Break point: Ertapenem > 2 μg/ml, imipenem > 4 μg/ml, Meropenem > 4 μg/ml