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Table 1 MIC50 and MIC90 values and percent antimicrobial resistance for A. baumannii and P. aeruginosa clinical isolates

From: Emergence of 16S rRNA methylase-producing Acinetobacter baumannii and Pseudomonas aeruginosa isolates in hospitals in Vietnam

Antimicrobial agent   A. baumannii(n = 101) P. aeruginosa(n = 15)
Breakpoint forresistancea(mg/L) %Resistance Range(mg/L) MIC50(mg/L) MIC90(mg/L) Breakpoint forresistancea(mg/L) %Resistance Range(mg/L) MIC50(mg/L) MIC90(mg/L)
Amikacin ≥64 85 <2- > 1024 >1024 >1024 ≥64 60 <2- > 1024 64 >1024
Arbekacin - - <2- > 1024 >1024 >1024 - - 2- > 1024 2 >1024
Aztreonam - - <2- > 256 128 >256 ≥32 46 4- > 256 16 >256
Ceftazidime ≥32 55 <4- > 512 >512 >512 ≥32 46 <4- > 512 16 >512
Ciprofloxacin ≥4 98 <1- > 128 128 >128 ≥4 66 <1-64 8 32
Colistin ≥4 6 <0.25-4 2 2 ≥8 0 <0.25-0.5 <0.25 0.5
Gentamicin ≥16 91 <2- > 1024 >1024 >1024 ≥16 66 <2- > 1024 256 >1024
Imipenem ≥16 48 <4-128 16 32 ≥8 53 <4-64 16 32
Meropenem ≥16 51 <4- > 256 32 64 ≥8 53 <4-32 16 32
Piperacillin ≥128 100 <4- > 512 >512 >512 ≥128 46 <4- > 512 32 256
Piperacillin/Tazobactam ≥128/4 52 <4- > 512 256 512 ≥128/4 13 <4-512 32 128
  1. aBreakpoints for antimicrobial resistance were determined according to the guidelines of the Clinical and Laboratory Standards Institute (M07-A9).