laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Staphylococcus aureus, equivalent collections 25923, NCTC 12981, DSM 1104, WDCM 00034, recomended by 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 L63RS1002, todylaboratories®