A zone of inhibition is:
A) The area on the agar plate where the drug no longer diffuses into the agar
B) The area around the antibiotic disk where the bacteria cannot not grow
C) The zone around the edge of the plate where the streaking does not cover the agar and bacterial growth is inhibited
D) All of the above

Question

Quizplus · Accepted Answer

The disk diffusion test depends on the formation of a gradient of antimicrobial concentrations as the antimicrobial agent diffuses radially into the agar.The drug concentration decreases at increasing distances from the disk.At a critical point,the amount of drug at a specific location in the medium is unable to inhibit the growth of the test organism,and a zone of inhibition is formed.The zones of inhibition are related to minimal inhibitory concentrations (MICs).

A Zone of Inhibition Is