Use Violet Red Bile Agar for examination of food, animal feed, and environmental samples for the presence of indicator groups such as coliforms. Besides safety, indicator groups provide a measure of food quality and spoilage potential. One of the most common groups of bacteria employed as indicator organisms by the food industry are the coliforms, which can be regarded as a subgroup within the Enterobacteriaceae.

• Easy-to-read: organisms rapidly fermenting the lactose (coliforms) form red-purple colonies with red-purple halos; while late lactose fermenters form pale colonies with greenish halos.
• Selective: crystal violet and bile salts suppress the growth of non-target Gram-positive bacteria.

Druce et al.³ found that Violet Red Bile Lactose Agar was as good an indicator of coli-aerogenes bacteria in milk as MacConkey Broth, and that the Violet Red Bile Agar was suitable for determining the coli-aerogenes content of milk.

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