Question

multiple choice question
in this image of a kirby - bauer test, the zone of inhibition is greatest for the antibiotic
○ vancomycin
○ polymyxin b
○ tetracycline
(image with labels: vancomycin, tetracycline, polymyxin b pointing to respective discs in the kirby - bauer test setup)

Explanation:

In a Kirby - Bauer test, the zone of inhibition is the area around an antibiotic - impregnated disk where bacterial growth is inhibited. By visually inspecting the image, we can see that the area around the Polymyxin B disk has the largest zone of inhibition (the clearest and most extensive area without bacterial growth compared to Vancomycin and Tetracycline).

Answer:

B. polymyxin B