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 gel balls x25 microliters, individually packed in 10 eppendorf tubes, keep at freezer (-20°C-10°C), transported at room temperature for up to 1 week, C.F.U between 10^6-10^9, used in liquid media, saline or distilated water, code L63RS1001, todylaboratories®