~~2. The disk-diffusion method was used to evaluate the effectiveness of three antibiotics on bacterial growth. The results were as follows: Antibiotic Zone of inhibition X Y N 30 mm- 5 mm 11 mm a. Which antibiotic was the most effective against the microorganism? Why? (2 points) b. Based on these results, which antibiotic would you recommend for treatment of a disease caused by this bacterium? Why? (2 points) c. How might you determine whether the effect of antibiotic Z in this experiment was bactericidal or bacteriostatic? Briefly explain what you would need to see to conclude that the effect was either bactericidal or bacteriostatic. (2 points)
-~5. The data below was collected from soaps after one week of use at a hospital nurses' hand washing station. Data are expressed as the percentage of soap products contaminated. What conclusions can you draw from these data? Why? (5 points) Type of Organisms Total Bacteria Gram-positiv e cocci Gram-negativ e rods Bar Soap 95% 83% Screw Top Liquid Soap 71% 70% 12% 1% Slit Top Flip Liquid Soap 39% 38% 1% Flip & Pump Liquid Soap 10% 9% 1% Pump Liquid Soap 0% 0% 0%
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