In a Kirby-Bauer susceptibility test, the presence of a zone of inhibition around disks containing antimicrobial agents indicates __________ .
a. That the microbe does not grow in the presence of the agents
b. That the microbe grows well in the presence of the agents
c. The smallest amount of the agent that will inhibit the growth of the microbe
d. The minimum amount of an agent that kills the microbe in question

검증된 단계별 안내

Understand the purpose of the Kirby-Bauer susceptibility test: it is used to determine the sensitivity of bacteria to various antimicrobial agents by observing bacterial growth around antibiotic disks on an agar plate.

Recognize that the 'zone of inhibition' is the clear area surrounding an antimicrobial disk where bacterial growth has been prevented or reduced.

Interpret the presence of a zone of inhibition as an indication that the antimicrobial agent is effective at inhibiting the growth of the microbe in that area.

Differentiate between inhibition of growth and killing of bacteria: the Kirby-Bauer test shows inhibition (bacteriostatic effect), not necessarily killing (bactericidal effect).

Conclude that the zone of inhibition means the microbe does not grow in the presence of the antimicrobial agent, corresponding to option (a).

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Kirby-Bauer Susceptibility Test

The Kirby-Bauer test is a standardized method used to evaluate the effectiveness of antibiotics against bacteria. It involves placing antibiotic-impregnated disks on an agar plate inoculated with the test microbe. After incubation, zones of inhibition around disks indicate areas where bacterial growth is prevented.

Zone of Inhibition

A zone of inhibition is a clear area surrounding an antibiotic disk where bacterial growth has been halted. Its size reflects the susceptibility of the microbe to the antimicrobial agent; a larger zone generally means greater sensitivity, indicating the antibiotic effectively inhibits growth.

Antimicrobial Susceptibility vs. Resistance

Susceptibility means the microbe's growth is inhibited by the antimicrobial agent, while resistance means the microbe can grow despite the agent's presence. The Kirby-Bauer test helps distinguish between these by showing whether zones of inhibition form around antibiotic disks.