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 & CNA Selective Supplement
|Shelf Life (days)
|Storage Temp (°C)
|White colonies with β-haemolysis
|White colonies with α-haemolysis