Fill in the Blank In the disk-diffusion assay, a large zone...

Fill in the Blank
In the disk-diffusion assay, a large zone of inhibition around a disk to which a chemical disinfectant has been applied indicates ________ of the test microbe to the chemical disinfectant.

Key Concepts

Disk Diffusion Assay

This is a laboratory method used to evaluate the effectiveness of antimicrobial agents against bacteria. In the assay, a disk impregnated with the agent is placed on an agar plate that has been inoculated with a test microbe, and the agent diffuses into the surrounding medium, creating a gradient of concentration. The method provides a visual representation of the microbe's response to the agent based on whether growth is inhibited in the area surrounding the disk.

Zone of Inhibition

The zone of inhibition is the clear area around the disk on an agar plate where microbial growth has been inhibited by the diffusing chemical disinfectant. The size of this zone reflects the efficacy of the tested agent; a larger zone typically signifies that the microbe is more susceptible to the agent, whereas a smaller zone may indicate resistance, making this concept key in interpreting antimicrobial susceptibility tests.

Antimicrobial Susceptibility

Antimicrobial susceptibility refers to the sensitivity of a microorganism to a particular antimicrobial agent. Determining susceptibility helps in selecting appropriate chemicals or drugs for treatment. In assays like disk diffusion, measuring the extent of inhibition gives a practical indication of whether the test microbe can be effectively controlled or eradicated by the antimicrobial compound.

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