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In the Kirby Bauer assay, the clear circle around a drug disk is called the:

AZone of incubation
BZone of inspection
CZone of insulation
DZone of inhibition
Answer & Solution
Correct answer: D. Zone of inhibition
1. Bacteria fail to grow near an effective drug. 2. A clear ring appears on the lawn. 3. That ring is the zone of inhibition. _Source: OpenStax Microbiology, Chapter 14, Antimicrobial Drugs._
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