Selective media :
* Selective media are the media which contain selective agents that permit growth of desired organism and inhibit growth of others.
* Examples of common selective media are azide blood agar, MacConkeys agar, deoxycholate citrate agar.
* For examples, addition of sodium azide at specific concentration into media inhibits gram negative bacteria and selectively allows growth of stapylococcus and streptococcus species.
* Mac Conkeys agar contains selective substance, the bile salt (sodium taurocholate), this substance inhibits growth of non intestinal organisms and allows growth of intestinal organisms.
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