laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Staphylococcus epidermidis, equivalent collections 12228, NCTC 13360, WDCM 00036, 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 L37RS1058-10, todylaboratories®