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Table 2 MIC ranges, MIC50 and MIC90 values based on outbreak

From: Molecular characterization and antimicrobial susceptibility of Acinetobacter baumannii isolates obtained from two hospital outbreaks in Los Angeles County, California, USA

Outbreak Antimicrobial agents MIC, μg/ml
range MIC50 MIC90
Outbreak X (n = 26) Amikacin 1–256 256 256
Gentamicin 4–256 256 256
Tobramycin 0.5–256 256 256
Imipenem 2–32 16 32
Meropenem 8–64 32 64
Piperacillin 256 256 256
Cefepime 64–256 128 256
Cefotaxime 256 256 256
Ceftazidime 256 256 256
Ceftriaxone 256 256 256
Ciprofloxacin 64–256 256 256
Gatifloxacin 4–64 32 64
Levofloxacin 16–32 32 32
Polymyxin B 0.25–0.5 0.25 0.5
Outbreak Y (n = 12) Amikacin 256 256 256
Gentamicin 256 256 256
Tobramycin 256 256 256
Imipenem 1–32 32 32
Meropenem 2–32 32 32
Piperacillin 256 256 256
Cefepime 32 32 32
Cefotaxime 256 256 256
Ceftazidime 128–256 256 256
Ceftriaxone 256 256 256
Ciprofloxacin 64–128 128 128
Gatifloxacin 8–64 16 32
Levofloxacin 16–64 32 64
Polymyxin B 0.25 0.25 0.25