Oxford Medium Base is used to prepare Oxford Medium or Modified Oxford Medium for isolating and differentiating Listeria monocytogenes.

• Listeria species grow over a pH range of 4.4-9.6
• Dehydrated appearance: Tan, free-flowing, homogeneous
• Motility is most pronounced at 20°C

The most common contaminating bacteria found in food sources potentially containing Listeria are streptococci, especially in the enterococci, micrococci and Bacillus species, Escherichia coli, Pseudomonas aeruginosa, and Proteus vulgaris.