Table 2 Colistin susceptibility testing policies and methods for Enterobacterales.

From: A prospective matched case-control study on the genomic epidemiology of colistin-resistant Enterobacterales from Dutch patients

Policy for colistin susceptibility testing

Colistin susceptibility testing method

Num. of labs

Initial test

Confirmation test

Always

VITEK

BMDa–c

7

  

Etestd

1

  

Unknownc

1

Only when considering colistin as treatment

BMD

None

1

 

Unknown

Unknownc

1

In case of a combination of factors

BMD

None

2

 

Etest or BMD

None

1

 

VITEK or BMD

BMD if VITEK was useda

1

  

BMD and when ColR NGSa

1

Only for this study

  

1

No data available

  

5

Total

  

22

  1. Confirmation test is performed when: acolistin is considered as treatment, bin case of a combination of criteria, cthe isolate is colistin-resistant in the initial test and has certain characteristics or dthe isolate is colistin-resistant in the initial test.
  2. BMD broth microdilution, ColR colistin-resistant, NGS next-generation sequencing.
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