Which of the following best demonstrates the efficiency level of a surface disinfectant used in a dental office?

The standard used to demonstrate intermediate-level disinfection efficacy is tuberculocidal activity (ability to kill Mycobacterium tuberculosis). Mycobacterium tuberculosis is among the most resistant non-spore-forming organisms and is used as a benchmark because if a disinfectant can kill it, it will also kill most other vegetative bacteria, fungi, and lipid-enveloped viruses. Disinfectants are classified as low-level (kills most bacteria and some viruses), intermediate-level (tuberculocidal; also kills non-lipid viruses), or high-level (kills all except large numbers of bacterial spores). Sporicidal activity would indicate sterilization, not disinfection. The ADA and CDC use tuberculocidal efficacy as the standard for dental surface disinfectants.