I tested MIC of colistin against E.coli. And i found that there is not MIC break point stated in CLSI.
Take a look in the file, colistin is as miscellaneous agents. I hope it helps.
The EUCAST guidelines (v5, 2015-01-01) give an MIC clinical breakpoint of 2 mg/L (S ≤; R >) for Enterobacteriaceae and colistin.
In the address below you can find the EUCAST MIC Clinical Breakpoints for all bacteria http://www.eucast.org/clinical_breakpoints/
You can find it in current EUCAST Guidelines.
You can easily find colistin values on EUCAST guidelines :)
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