laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Streptococcus pyogenes (Streptococ beta-hemolitic group A), equivalent collections 19615, NCTC 12696, 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 L37RS1062-10, todylaboratories®