This is a selective medium for the isolation of Staphylococcus and Streptococcus spp. Based on Columbia Agar, it is enriched by the addition of Sheep Blood (7%) the medium is also made selective by the inclusion of Colistin and Naladixic Acid to suppress the growth of the majority of Gram negative bacteria. The addition of sheep blood the medium allows for good colonial appearance, pigment production and excellent haemolysis from beta-haemolytic streptococci.
Columbia Agar Base with 7% Defibrinated Sheep Blood and CNA Selective Supplement
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Product Description
| Organisms | Ref. No | Result |
| Staphylococcus aureus | NCTC 12981 | White colonies |
| Streptococcus pyogenes | NCTC 12696 | White colonies with β-haemolysis |
| Streptococcus pneumoniae | NCTC 12977 | White colonies with α-haemolysis |
| Proteus mirabilis | NCTC 10975 | Inhibited |
| Pseudomonas aeruginosa | NCTC 12903 | Inhibited |
