laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Escherichia coli, equivalent collections 11775, NCTC 9001, DSM® 30083, WDCM 00090, vial x10 discs, keep at freezer, C.F.U between 10^6-10^9, freeze-dried, water-soluble, used in solid or liquid media, code L37RS1022-10, todylaboratories®