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. 2019 Jan 30;57(2):e01163-18. doi: 10.1128/JCM.01163-18

TABLE 4.

Summary of reproducibility of the various methods to determine colistin MICs for mcr-1-positive Escherichia coli isolates

CDC AR Bank accession no.	Colistin MIC (µg/ml)
	CDC result	Broth microdilution				Broth macrodilution				CBDE
	CDC result	Day 1	Day 2	Day 3	Mode	Day 1	Day 2	Day 3	Mode	Day 1	Day 2	Day 3	Mode
346	4	4	>4	>4	>4	8	8	8	8	4	4	4	4
349^a	2–4	2	4	4	4	2	2	2	2	2	4	4	4
350^a	4	2	4	4	4	4	4	4	4	4	4	4	4
493	8	>4	>4	>4	>4	8	8	8	8	4	4	4	4
494	8	>4	>4	>4	>4	8	8	8	8	4	4	4	4
495^a	4	4	4	4	4	4	4	4	4	4	4	4	4

^a

Isolates that demonstrated MICs of 2 µg/ml by colistin broth disk elution on initial testing at both sites.