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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