laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Proteus vulgaris (P. hauseri), equivalent collections 13315, NCTC 4175, 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 L37RS1040-10, todylaboratories®