Columbia Sheep Blood CNA Agar II - 20 pcs.

Blood CNA Agar, or more correctly, Columbia CNA Agar with 5% Sheep Blood, is a selective medium for the isolation of Gram-positive microorganisms, especially staphylococci and streptococci, from a variety of clinical and non-clinical samples.
CNA stands for the additives colistin and nalidixic acid, which inhibit the growth of most (but not all) Gram-negative bacteria (especially the Proteus and Pseudomonas groups).
The sheep blood allows for the detection of hemolytic reactions, which are particularly important for the presumptive diagnosis of streptococci.

The Blood CNA plate is therefore primarily used for the isolation of pure cultures from samples with mixed flora.
To ensure the detection and selection of all pathogens present in the sample, the material must simultaneously be streaked onto appropriate non-selective media, e.g., Columbia Agar with 5% Sheep Blood (without CNA) and another selective medium such as MacConkey Agar.

Caution: certain multidrug-resistant Gram-negative bacteria and yeasts also grow on Blood CNA.