Description : Violet Red Bile Agar is used for enumerating coliform organisms in dairy products. The coliform group of bacteria includes aerobic and facultatively anaerobic gram negative non sporeforming bacilli that ferment lactose and form acid and gas at 35°C within 48 hours. Members of the Enterobacteriaceae comprise the majority of the group but other lactose fermenting organisms may also be included. Procedures to detect, enumerate and presumptively identify coliforms are used in testing foods and dairy