A selective medium contains one or more substances that inhibit growth of some microbes to facilitate the growth of other desired microbes.

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Selective media are designed to allow for the growth of specific organisms while inhibiting the growth of others. This is achieved by including specific substances that target certain types of bacteria or fungi, while leaving others unaffected. Examples of selective media include Eosin Methylene Blue agar, which inhibits the growth of gram-positive bacteria while allowing gram-negative bacteria to grow, and Sabouraud agar, which inhibits the growth of bacteria and promotes the growth of fungi.

A Selective Medium Contains One or More Substances That Inhibit