selective culture medium

a liquid or solid culture medium that contains inhibitory substances (antibiotics, dyes, tellurite, bile salts, etc.) that allow the growth of the desired microorganism while inhibiting the growth of contaminants.

Selective culture medium. Bacteroides fragilis grows on bile-esculin agar; most aerobic and anaerobic bacteria are inhibited by bile and gentamicin in this medium, whereas B. fragilis is stimulated by bile, resistant to gentamicin, and able to hydrolyze esculin, producing a black precipitate.

Medical dictionary. 2011.

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