Question

Which of the following will tell you if a disinfectant is bacteriocidal—Disk diffusion &/ or use dilution test

A) Disk diffusion test
B) Use dilution test
C) Both A and B
D) Neither A nor B

Answer 1

Both the disk diffusion test and use dilution test can determine if a disinfectant is bacteriocidal by measuring the effectiveness of the disinfectant in inhibiting or killing the target microorganism.

Step-by-step explanation:

The disk diffusion test and use dilution test can both be used to determine if a disinfectant is bacteriocidal. The disk diffusion test involves placing antimicrobial discs on an agar plate that has been inoculated with the microbe. The size of the zone of inhibition around each disc indicates the effectiveness of the disinfectant. The use dilution test, on the other hand, involves dipping a stainless steel cylinder in a culture of the microorganism and then in solutions of disinfectant. Bacterial survival is indicated by turbidity in the medium, while killing of the microorganism by the disinfectant produces no turbidity.