A medium for the enumeration of coliform organisms in food and dairy products. Lactose fermenters produce red/purple colonies often surrounded by a halo of the same colour. Non-lactose fermenters produce pale colonies. Selective agents are Bile salts and crystal violet used to inhibit Gram positive and non-enteric organisms.
Violet Red Bile Agar (VRBA)
Additional Information
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Product Description
| Organisms | Ref. No | Result |
| Pseudomonas aeruginosa | NCTC 12903 | Colourless – Beige Colonies |
| Escherichia coli | NCTC 12923 | Dark red/ purple colonies with precipitation halo |
| Enterococcus faecalis | NCTC 12697 | Inhibited |
