| Identifiers |
 |
| Product Name |
SalmONella Shigella Agar (SS Agar) |
| Catalogue No. |
CM511023 |
|
Description |
The SS Agar is a highly selective agar for the isolation of Salmonella and Shigella species from very contaminated samples. Selectivity is obtained by a high concentration of bile salts and brilliant green, which inhibits the growth of gram-positive bacteria. As for the other gram-negative flora, its growth is highly repressed by the presence of citrate and thiosulfate. Nevertheless, some coliforms may still grow on this medium. In such case, differentiation between pathogenic species and coliforms becomes evident by the colour change of the pH indicator neutral red. Lactose fermenters produce a pink or red colored medium and colonies, while non-fermenting species form colourless colonies and turn the medium yellow. Should any species eventually produce H2S, it will be easily detected by the ferrous sulfide’s black precipitate, which turns the colonies black. The peptone and the meat extract are usually capable of inducing the growth of most pathogenic species, nevertheless some Shigel |
|
Application |
Solid and selective medium for the isolation of Salmonella and Shigella species. |