What cells or organisms can disinfectants kill?

• A. Bacteria and some viruses, but not spores.
• B. All bacteria, viruses, fungi, and spores.
• C. Only viruses.
• D. Only fungi.

Answer: (A)

Disinfectants are used to reduce or destroy microorganisms on surfaces, but they are not the same as sterilants. They effectively kill many bacteria and can inactivate a range of viruses, depending on the product and how long it’s left in contact with the surface. However, bacterial spores are highly resistant to chemical agents, so disinfectants do not reliably kill spores. To achieve spore elimination, sterilization or sporicidal agents are required. That’s why the statement that disinfectants kill bacteria and some viruses, but not spores, is the most accurate choice.