Middlebrook 7H11 Agar Base BD BBL™ 500 g. Used in qualitative procedures for isolation and cultivation of mycobacteria, especially Mycobacterium tuberculosis, from clinical and non-clinical specimens. Middlebrook OADC Enrichment (Cat. Nos. 211886 or 212240 or 212351) and Glycerol must be added to the Agar Base before use.