Table 3 Colistin susceptibility testing policies and confirmation of submitted isolates.

Used test result for isolate selection	Num. of labs	COLR-EK				COLS-EK
Used test result for isolate selection	Num. of labs	Colistin susceptibility testing method^a	Submitted	Confirmed	%	Colistin susceptibility testing method^a	Submitted	Confirmed	%
Screening test	15	Automated^b	106	61	57.5%	Automated^c	80	61	76.3%
Confirmation test	7	BMD/Etest	13	11	84.6%	Automated	12	11	91.7%
Total	22		119	72	60.5%		92	72	78.3%

Of note: This tabe also includes isolates that are rejected based on other reasons than an incorrect colistin MIC.
^aUnknown method for the five laboratories with no submitted isolates.
^bAlso two submitted isolates with disk diffusion and two isolates with an Etest.
^cAlso one submitted isolate with disk diffusion.
BMD broth microdilution, COLR-EK colistin-resistant E. coli or K. pneumoniae, COLS-EK colistin-susceptible E. coli or K. pneumoniae.

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