Which of the following best describes tuberculocidal disinfectants?

• A. They are safe for wooden surfaces
• B. They are odorless and colorless
• C. They are capable of killing Mycobacterium tuberculosis and other tough pathogens when used as labeled
• D. They are only effective against bacteria, not viruses

Answer: (C)

Tuberculocidal means a disinfectant has been proven to kill Mycobacterium tuberculosis, the tough bacterium with a waxy cell wall. Because of that resistant structure, products labeled tuberculocidal are capable of inactivating TB bacteria when used exactly as directed on the label—correct dilution, contact time, and surface compatibility. This label-driven efficacy is what makes the description true: it targets a particularly hardy pathogen and requires proper use to achieve the kill.

Context helps: TB bacteria resist many ordinary cleaners, so a product must show tuberculocidal efficacy under real-use conditions to be labeled as such. These disinfectants are often broad-spectrum as well, capable of killing other hard pathogens beyond TB, viruses, and fungi when used according to the label. That’s why the other statements don’t define tuberculocidal: they’re not universal truths about safe surfaces, odor, or exclusivity to bacteria.