Eosin methylene blue (EMB)agar contains dyes that inhibit the growth of Gram-positive organisms and bile salts that prevent the growth of Gram-negative bacteria other than fecal coliforms.Also included in EMB are stains that show a color change when an organism ferments lactose.This media is best described as

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EMB agar contains selective ingredients that inhibit the growth of Gram-positive bacteria and some Gram-negative bacteria, making it a selective media. Additionally, differentiation occurs based on the ability of some Gram-negative bacteria to ferment lactose, resulting in a color change in the colonies. Therefore, EMB agar is also a differential media.

Eosin Methylene Blue (EMB)agar Contains Dyes That Inhibit the Growth