FIELD: microbiology, medicine. SUBSTANCE: set consists of staining mixture including auramine of laser purity and rhodamine C or rhodamine 4C of laser purity taken at mass ratio = (12:1)-(25:1), respectively, and background suppressing agent which includes phenoxazine dye - 3,6-diethylaminophenoxazonium perchlorate or 3,6-diethylaminophenoxazonium zinc salt, or 5-amino-9-diethylaminobenzo[a] phenoxazonium acetate, or 5-amino-9-diethylaminobenzo[a]phenoxazonium isobutyrate of laser purity. Diagnostical set ensures to detect small and ultrasmall mycobacterium forms, cell division of both typical and morphologically alternated mycobacteria. EFFECT: enhanced effectiveness of set. 1 tbl
