laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Escherichia coli, equivalent collections 25922, NCTC 12241, DSM 1106, WDCM 00013, recomended by EUCAST & CLSI, vial x10 discs, keep in the freezer, C.F.U between 10^6-10^9, freeze-dried, water-soluble, used in solid or liquid media, code L37RS1017-10, todylaboratories®