This is a medium for the selective isolation of Staphylococcus spp. and Streptococcus spp. primarily from clinical specimens. Based on Columbia Agar Base enriched with 7% Horse Blood the medium is made selective by the inclusion of Colistin and Nalidixic Acid to suppress the growth of the majority of Gram negative bacteria.
Columbia Agar Base with 7% Defibrinated Horse Blood & CNA Selective Supplement
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Product Description
| Organisms | Ref. No | Result |
| Staphylococcus aureus | NCTC 12981 | White colonies |
| Streptococcus pyogenes | NCTC 12969 | Small colonies with β- haemolysis |
| Streptococcus pneumoniae | NCTC 12977 | Grey / green colonies with α-haemolysis |
| Proteus mirabilis | NCTC 10975 | Inhibited |
| Pseudomonas aeruginosa | NCTC 12903 | Inhibited |
