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Table 3 Rapid ResaPolymyxin Acinetobacter/Pseudomonas NP test results among Gram-negative isolates

From: Evaluation of resazurin-based assay for rapid detection of polymyxin-resistant gram-negative bacteria

Organism

Susceptibility to polymyxins

Resistance mechanism

Isolates

Rapid ResaPolymyxin Acinetobacter/Pseudomonas NP test

Sensitivity

Specificity

A. baumannii

Resistant

Mediated by chromosomea

8 (3.16%)

8 positive result

100%

96%

Susceptible

 

50 (19.76%)

48 negative results and 2 positive result

  

P. aeruginosa

Resistant

Mediated by chromosome

11 (4.35%)

11 positive result

100%

100%

Susceptible

 

50 (19.76%)

50 negative results

  

K. pneumoniae

Resistant

Mediated by chromosomea

20 (7.91%)

20 positive result

100%

100%

Susceptible

 

50 (19.76%)

50 negative results

  

E. coli

Resistant

Mediated by plasmid

14 (5.54%)

2 positive result

100%

100%

Susceptible

 

50 (19.76%)

50 negative results

  
  1. aUnpublished