Bordet Gengou Agar Base 1107 Condalab

Azide Blood Agar Base contains Sodium azide which has been proved to have a bacteriostatic effect on Gram-negative bacteria. Therefore, this medium can be used for the isolation of streptococci and staphylococci in clinical specimens, water, foods, etc. Peptone mixture and Beef extract provide nitrogen, vitamins, minerals, and amino acids essential for growth and bacteriological agar is the solidifying agent. Sodium chloride supplies essential electrolytes for transport and osmotic balance.

The 0.02% Sodium Azide in blood agar was reported to prevent the swarming of Proteus. It allows the selective isolation from mixed bacterial populations. Gram-negative organisms are inhibited by Sodium azide. The medium can be supplemented with 5% sheep blood so it can be used for the investigation of haemolytic reactions of fastidious pathogens. Haemolytic patterns may vary with the type of blood or base medium used. For instance, defibrinated sheep blood gives best results for Group A streptococci.