In a disk diffusion assay for drug susceptibility,a drug producing a larger clear zone is always more effective than a drug than to one producing a smaller clear zone.

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The size of the clear zone in a disk diffusion assay indicates the drug's ability to inhibit bacterial growth under the specific conditions of the assay, but it does not directly measure the drug's overall effectiveness in treating infections, which can depend on factors like absorption, distribution, metabolism, excretion, and the site of infection.

In a Disk Diffusion Assay for Drug Susceptibility,a Drug Producing