Infection Control · single question
A disinfectant's efficiency level is demonstrated by its ability to kill which organism?
Show answer and explanation
Correct answer: D. Mycobacterium tuberculosis
- A. Sporicidal activity defines STERILIZATION, not disinfection — a higher standard than the intermediate-level benchmark.
- B. Fungicidal activity is a separate, lower-bar claim.
- C. E. coli is a vegetative gram-negative organism and is comparatively easy to kill.
- D. Correct. Tuberculocidal activity is the benchmark for intermediate-level disinfection. M. tuberculosis has a waxy, lipid-rich cell wall making it highly resistant, so a product that kills it will kill less resistant vegetative bacteria and most viruses.
Practice Infection Control questions Infection Control study notes