Antibiotic Rotation to Combat Resistance

Steps:

• Identify the goal: Reduce bacterial resistance by minimizing selective pressure on populations.
• Evaluate each option: Check if it limits exposure that allows resistant strains to survive and spread.
• Consider resistance mechanisms: Bacteria evolve resistance through mutations or gene transfer under antibiotic stress.
• Select the strategy: Choose the one that diversifies pressure to prevent dominance of any single resistant type.

Why C is correct:

• Rotating antibiotics disrupts adaptation by exposing bacteria to varying drugs, preventing widespread resistance as per evolutionary principles of selective pressure.

Why the others are wrong:

• A: High concentrations can kill most bacteria but survivors are highly resistant, accelerating spread.
• B: Routine prophylaxis increases unnecessary exposure, promoting resistance in non-infected populations.
• D: Treating low-level infections uses sub-lethal doses, allowing partial survival and resistance selection.

Final answer: C