laboratory diagnostic - testing and comparison - biological samples and assessment reports - quality control - internal - reference strains - qualitative - Bacillus subtilis subsp spizizenii, equivalent collections 6633, NCTC 10400, DSM 347, WDCM 00003, 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 L37RS1003-10, todylaboratories®