zone of inhibition


zone of in·hib·i·tion

(zōn in'hi-bish'ŭn) The area around an antibiotic disc that contains no bacterial growth.

zone of inhibition

an area of GROWTH inhibition around a point source, within a lawn of cultured organisms on a solid MEDIUM, due to the action of a growth-inhibitory substance, such as an ANTIMICROBIAL AGENT, present at the source. See also PLAQUE.