Definition for Diffusion Susceptibility Test
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A diffusion susceptibility test Kirby-Bauer test is a simple, inexpensive test widely used to reveal which drug is most effective against a particular pathogen. The procedure involves inoculating a Petri plate uniformly with a standardized amount of the pathogen in question and arranging on the plate disks soaked in the drugs to be tested. In general, the larger the zone of inhibition around a disk, the more effective the drug.